Company lists · Data refreshed October 2026
Top 25 Mainframe application development software companies worldwide
RevenueBase identified 265 company matches for mainframe application development software companies worldwide as of October 2026 and tracks 32,503 professional contacts across them, including 632 with verified work emails. The United States is the largest market and Paris the largest hub.
This list covers company matches for mainframe application development software companies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 19, 2026. Country and city lists for mainframe application development software companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest mainframe application development software companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 207 contacts → | ||||
Exact match “Astadia is the industry leader for mainframe migrations and modernizations.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 2 | 167 contacts → | ||||
Exact match “Embarcadero tools are built for elite developers who build and maintain the world’s most critical applications.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 3 | 141 contacts → | ||||
Exact match “Macro 4, a division of UNICOM Global, provides software solutions for customer communications, information management, application decommissioning, mainframe modernization and…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 4 | 124 contacts → | ||||
Exact match “MOST Software Technologies helps customers leverage their investment in mainframe applications.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 5 | 85 contacts → | ||||
Exact match “Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 6 | 78 contacts → | ||||
Exact match “Eccox develops technologies that deliver effective results to mainframe software programmers.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 7 | 67 contacts → | ||||
Exact match “Sinersys Technologies es una organización orientada a proporcionar Soluciones de Negocio a través de Servicios en Tecnologías de Información (TI), particularmente en desarrollo y…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 8 | 64 contacts → | ||||
Exact match “Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 9 | 46 contacts → | ||||
Exact match “The UNICOM Systems Technology Division delivers world-class CICS automation and z/OS and z/VM software solutions to IBM Z customers globally, integration services and solutions to…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 10 | 46 contacts → | ||||
Exact match “ETA bugün aşkın müşterisi, yurt çapına yayılmış bayisi, dört merkezde çalışan 100’ü aşkın personeli, her ihtiyaca cevap veren geniş ve kaliteli ürün yelpazesi, yeni kitlelere…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 11 | 40 contacts → | ||||
Exact match “Since 1993, Syspertec Group has been developing software solutions designed to simplify information system integration and modernize complex technical environments.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 12 | 38 contacts → | ||||
Exact match “ASNA is a leading authority in the modernization, extension, and migration of IBM i RPG assets.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 13 | 35 contacts → | ||||
Exact match “MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 14 | 35 contacts → | ||||
Exact match “Advanced Software Products Group, Inc.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 15 | 34 contacts → | ||||
Exact match “Since 1995 Flynet have been building some of the industry's most sophisticated web based solutions for Mainframe, Unix, IBM i, VMS, VAX and MultiValue systems.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 16 | 28 contacts → | ||||
Exact match “Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 17 | 27 contacts → | ||||
Exact match “We develop integrated information systems to be used in companies with modules that are customized according to the customer’s wishes.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 18 | 27 contacts → | ||||
Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 19 | 26 contacts → | ||||
Exact match “EasiRun is a European global provider of products, tools and solutions for software and software development with a focus on modernizing COBOL applications and development…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 20 | 26 contacts → | ||||
Exact match “TONE SOFTWARE CORPORATION is a high technology software development firm specializing in IT infrastructure management solutions for z/OS mainframes.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 21 | 25 contacts → | ||||
Exact match “Raincode provides ASM370, COBOL & PL/I compilers and tools to migrate mainframe to.NET, Azure, LINUX.NETCore Having a COBOL or a PL/I past shouldn’t force you to build more COBOL…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 22 | 25 contacts → | ||||
Exact match “IBM Z® IntelliMagic Vision for z/OS® is advanced performance analysis software for IBM Z.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 23 | 25 contacts → | ||||
Exact match “Select provides comprehensive solutions consisting of tools and services for information access and enterprise reporting, as well as business critical IT software development…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 24 | 22 contacts → | ||||
Exact match “Since 1978, Trident Services has established a solid reputation for the excellence of its developed software, responsiveness of its support team and the expertise of its…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
| 25 | 21 contacts → | ||||
Exact match “Com 35 anos de experiência no mercado, a GFS desenvolve softwares com alta confiabilidade e qualidade, os quais têm como diferencial a simplicidade de implantação, uso e…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “mainframe application development software companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 265 mainframe application development software companies worldwide
See the full list, filter by size, metro and specialty, and access 632 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Mainframe application development software companies worldwide at a glance
As of Oct 19, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for mainframe application development software companies are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “mainframe application development software companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 632 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on October 19, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Mainframe application development software companies by location
1 lists · largest firstEvery Mainframe application development software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “mainframe application development software companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many mainframe application development software companies are there worldwide?
RevenueBase identified 265 company matches for mainframe application development software companies worldwide as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Astadia tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most mainframe application development software companies?
The United States leads with 64 companies. Every mainframe application development software companies list by country and city is linked on this page.
Which city has the most mainframe application development software companies?
Paris leads with 5 company records, followed by Austin (3) and London (3).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 632 professional contacts with verified work emails tracked across these 265 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 19, 2026.
Ready to reach these companies? Verified emails and direct dials for all 265 mainframe application development software companies worldwide. Start with a free account, no credit card.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
Company intelligence · public preview
Top 25 mainframe application development software companies worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 265 matching company records for mainframe application development software companies worldwide, with 32,503 tracked contacts and 632 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: October 19, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 mainframe application development software companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Astadiaastadia.comHQ: St. Louis, MO, United StatesReported employees: 201-500 | St. Louis, MO, United States | 201-500 | Exact match | 207 contacts → |
“Astadia is the industry leader for mainframe migrations and modernizations.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Embarcadero Technologiesembarcadero.comHQ: Austin, TX, United StatesReported employees: 201-500 | Austin, TX, United States | 201-500 | Exact match | 167 contacts → |
“Embarcadero tools are built for elite developers who build and maintain the world’s most critical applications.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Macro 4macro4.comHQ: Crawley, United KingdomReported employees: 201-500 | Crawley, United Kingdom | 201-500 | Exact match | 141 contacts → |
“Macro 4, a division of UNICOM Global, provides software solutions for customer communications, information management, application decommissioning, mainframe modernization and…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Most Technologiesmosttechnologies.comHQ: Tokyo, IsraelReported employees: 51-200 | Tokyo, Israel | 51-200 | Exact match | 124 contacts → |
“MOST Software Technologies helps customers leverage their investment in mainframe applications.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Treehouse Softwaretreehouse.com HQ: Sewickley, PA, United StatesReported employees: 11-50 | Sewickley, PA, United States | 11-50 | Exact match | 85 contacts → |
“Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Eccox Technologyeccox.com HQ: Barueri, BrazilReported employees: 51-200 | Barueri, Brazil | 51-200 | Exact match | 78 contacts → |
“Eccox develops technologies that deliver effective results to mainframe software programmers.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Sinersys Technologiessinersystech.comHQ: México, MexicoReported employees: 51-200 | México, Mexico | 51-200 | Exact match | 67 contacts → |
“Sinersys Technologies es una organización orientada a proporcionar Soluciones de Negocio a través de Servicios en Tecnologías de Información (TI), particularmente en desarrollo y…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Vertalivertali.comHQ: Bromsgrove B60 3dj, United KingdomReported employees: 11-50 | Bromsgrove B60 3dj, United Kingdom | 11-50 | Exact match | 64 contacts → |
“Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Unicom Systems, INCunicomsi.com HQ: Mission Hills, CA, United StatesReported employees: 11-50 | Mission Hills, CA, United States | 11-50 | Exact match | 46 contacts → |
“The UNICOM Systems Technology Division delivers world-class CICS automation and z/OS and z/VM software solutions to IBM Z customers globally, integration services and solutions to…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  ETA Bilgisayareta.com.trHQ: İstanbul, TürkiyeReported employees: 51-200 | İstanbul, Türkiye | 51-200 | Exact match | 46 contacts → |
“ETA bugün aşkın müşterisi, yurt çapına yayılmış bayisi, dört merkezde çalışan 100’ü aşkın personeli, her ihtiyaca cevap veren geniş ve kaliteli ürün yelpazesi, yeni kitlelere…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Syspertec Groupsyspertec.comHQ: Saint-cloud, FranceReported employees: 11-50 | Saint-cloud, France | 11-50 | Exact match | 40 contacts → |
“Since 1993, Syspertec Group has been developing software solutions designed to simplify information system integration and modernize complex technical environments.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | ASNAasna.com HQ: Sant Cugat Del Vallès, SpainReported employees: 51-200 | Sant Cugat Del Vallès, Spain | 51-200 | Exact match | 38 contacts → |
“ASNA is a leading authority in the modernization, extension, and migration of IBM i RPG assets.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | ISI PTY LTDisi.com.au HQ: AustraliaReported employees: 51-200 | Australia | 51-200 | Exact match | 35 contacts → |
“MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | HQ: Naples, FL, United StatesReported employees: 51-200 | Naples, FL, United States | 51-200 | Exact match | 35 contacts → |
“Advanced Software Products Group, Inc.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Flynetflynetviewer.comHQ: Burwell, United KingdomReported employees: 11-50 | Burwell, United Kingdom | 11-50 | Exact match | 34 contacts → |
“Since 1995 Flynet have been building some of the industry's most sophisticated web based solutions for Mainframe, Unix, IBM i, VMS, VAX and MultiValue systems.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Heirloom Computingheirloomcomputing.comHQ: Alamo, CA, United StatesReported employees: 51-200 | Alamo, CA, United States | 51-200 | Exact match | 28 contacts → |
“Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Alcad D.O.Oalcad.siHQ: Slovenska Bistrica, SloveniaReported employees: 11-50 | Slovenska Bistrica, Slovenia | 11-50 | Exact match | 27 contacts → |
“We develop integrated information systems to be used in companies with modules that are customized according to the customer’s wishes.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Basis International LTDbasis.cloudHQ: Albuquerque, NM, United StatesReported employees: 11-50 | Albuquerque, NM, United States | 11-50 | Exact match | 27 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 19 |  Easirun Europa Gmbheasirun.comHQ: Usingen, GermanyReported employees: 11-50 | Usingen, Germany | 11-50 | Exact match | 26 contacts → |
“EasiRun is a European global provider of products, tools and solutions for software and software development with a focus on modernizing COBOL applications and development…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Tone Softwaretonesoft.com HQ: Orange, CA, United StatesReported employees: 51-200 | Orange, CA, United States | 51-200 | Exact match | 26 contacts → |
“TONE SOFTWARE CORPORATION is a high technology software development firm specializing in IT infrastructure management solutions for z/OS mainframes.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Raincoderaincode.com HQ: Brussels, BelgiumReported employees: 51-200 | Brussels, Belgium | 51-200 | Exact match | 25 contacts → |
“Raincode provides ASM370, COBOL & PL/I compilers and tools to migrate mainframe to.NET, Azure, LINUX.NETCore Having a COBOL or a PL/I past shouldn’t force you to build more COBOL…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  IBM Z Intellimagicibm.comHQ: Leiden, NetherlandsReported employees: 51-200 | Leiden, Netherlands | 51-200 | Exact match | 25 contacts → |
“IBM Z® IntelliMagic Vision for z/OS® is advanced performance analysis software for IBM Z.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Select Business Solutionsselectbs.com HQ: Shelton, CT, United StatesReported employees: 51-200 | Shelton, CT, United States | 51-200 | Exact match | 25 contacts → |
“Select provides comprehensive solutions consisting of tools and services for information access and enterprise reporting, as well as business critical IT software development…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Trident Services INCtriserv.com HQ: Capitola, CA, United StatesReported employees: 11-50 | Capitola, CA, United States | 11-50 | Exact match | 22 contacts → |
“Since 1978, Trident Services has established a solid reputation for the excellence of its developed software, responsiveness of its support team and the expertise of its…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  GFS Softwaregfs.com.brHQ: São Paulo, BrazilReported employees: 51-200 | São Paulo, Brazil | 51-200 | Exact match | 21 contacts → |
“Com 35 anos de experiência no mercado, a GFS desenvolve softwares com alta confiabilidade e qualidade, os quais têm como diferencial a simplicidade de implantação, uso e…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 265 company matches
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Mainframe application development software companies: dataset insights
October 19, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
263 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 265 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: October 19, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Mainframe application development software companies by location
1 lists · largest firstEvery Mainframe application development software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for mainframe application development software companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many mainframe application development software companies did RevenueBase find worldwide?
The saved snapshot records 265 matching company records, 32,503 tracked contacts and 632 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: October 19, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 mainframe application development software companies worldwide. Snapshot: October 19, 2026. https://revenuebase.ai/companies/browse/mainframe-application-development-software-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 mainframe application development software companies worldwide
RevenueBase records 265 matching company records for mainframe application development software companies worldwide, with 32,503 tracked contacts and 632 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: October 19, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 mainframe application development software companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Astadiaastadia.com HQ: St. Louis, MO, United StatesReported employees: 201-500 | St. Louis, MO, United States | 201-500 | Exact match | 207 contacts → |
“Astadia is the industry leader for mainframe migrations and modernizations.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Embarcadero Technologiesembarcadero.com HQ: Austin, TX, United StatesReported employees: 201-500 | Austin, TX, United States | 201-500 | Exact match | 167 contacts → |
“Embarcadero tools are built for elite developers who build and maintain the world’s most critical applications.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Macro 4macro4.com HQ: Crawley, United KingdomReported employees: 201-500 | Crawley, United Kingdom | 201-500 | Exact match | 141 contacts → |
“Macro 4, a division of UNICOM Global, provides software solutions for customer communications, information management, application decommissioning, mainframe modernization and…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Most Technologiesmosttechnologies.com HQ: Tokyo, IsraelReported employees: 51-200 | Tokyo, Israel | 51-200 | Exact match | 124 contacts → |
“MOST Software Technologies helps customers leverage their investment in mainframe applications.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Treehouse Softwaretreehouse.com HQ: Sewickley, PA, United StatesReported employees: 11-50 | Sewickley, PA, United States | 11-50 | Exact match | 85 contacts → |
“Since 1982, Treehouse Software has been helping mainframe customers with innovative tools, services, and training.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Eccox Technologyeccox.com HQ: Barueri, BrazilReported employees: 51-200 | Barueri, Brazil | 51-200 | Exact match | 78 contacts → |
“Eccox develops technologies that deliver effective results to mainframe software programmers.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Sinersys Technologiessinersystech.com HQ: México, MexicoReported employees: 51-200 | México, Mexico | 51-200 | Exact match | 67 contacts → |
“Sinersys Technologies es una organización orientada a proporcionar Soluciones de Negocio a través de Servicios en Tecnologías de Información (TI), particularmente en desarrollo y…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Vertalivertali.com HQ: Bromsgrove B60 3dj, United KingdomReported employees: 11-50 | Bromsgrove B60 3dj, United Kingdom | 11-50 | Exact match | 64 contacts → |
“Headquartered in the UK, Vertali has a long and distinctive pedigree providing IBM mainframe services, skills and software to organizations around the world.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Unicom Systems, INCunicomsi.com HQ: Mission Hills, CA, United StatesReported employees: 11-50 | Mission Hills, CA, United States | 11-50 | Exact match | 46 contacts → |
“The UNICOM Systems Technology Division delivers world-class CICS automation and z/OS and z/VM software solutions to IBM Z customers globally, integration services and solutions to…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | ETA Bilgisayareta.com.tr HQ: İstanbul, TürkiyeReported employees: 51-200 | İstanbul, Türkiye | 51-200 | Exact match | 46 contacts → |
“ETA bugün aşkın müşterisi, yurt çapına yayılmış bayisi, dört merkezde çalışan 100’ü aşkın personeli, her ihtiyaca cevap veren geniş ve kaliteli ürün yelpazesi, yeni kitlelere…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Syspertec Groupsyspertec.com HQ: Saint-cloud, FranceReported employees: 11-50 | Saint-cloud, France | 11-50 | Exact match | 40 contacts → |
“Since 1993, Syspertec Group has been developing software solutions designed to simplify information system integration and modernize complex technical environments.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | ASNAasna.com HQ: Sant Cugat Del Vallès, SpainReported employees: 51-200 | Sant Cugat Del Vallès, Spain | 51-200 | Exact match | 38 contacts → |
“ASNA is a leading authority in the modernization, extension, and migration of IBM i RPG assets.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | ISI PTY LTDisi.com.au HQ: AustraliaReported employees: 51-200 | Australia | 51-200 | Exact match | 35 contacts → |
“MAINFRAME IS AT OUR CORE ISI is an Australian mainframe expert distinguished by its surgical focus on mainframe technologies and a clear 30-year pedigree in mainframe…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | HQ: Naples, FL, United StatesReported employees: 51-200 | Naples, FL, United States | 51-200 | Exact match | 35 contacts → |
“Advanced Software Products Group, Inc.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Flynetflynetviewer.com HQ: Burwell, United KingdomReported employees: 11-50 | Burwell, United Kingdom | 11-50 | Exact match | 34 contacts → |
“Since 1995 Flynet have been building some of the industry's most sophisticated web based solutions for Mainframe, Unix, IBM i, VMS, VAX and MultiValue systems.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Heirloom Computingheirloomcomputing.com HQ: Alamo, CA, United StatesReported employees: 51-200 | Alamo, CA, United States | 51-200 | Exact match | 28 contacts → |
“Heirloom Computing is a global enterprise software company that partners with GSIs and CSPs to migrate mainframe workloads as cloud-native applications on any cloud.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Alcad D.O.Oalcad.si HQ: Slovenska Bistrica, SloveniaReported employees: 11-50 | Slovenska Bistrica, Slovenia | 11-50 | Exact match | 27 contacts → |
“We develop integrated information systems to be used in companies with modules that are customized according to the customer’s wishes.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Basis International LTDbasis.cloud HQ: Albuquerque, NM, United StatesReported employees: 11-50 | Albuquerque, NM, United States | 11-50 | Exact match | 27 contacts → |
No recorded description excerpt is available for this public record. | |||||
| 19 | Easirun Europa Gmbheasirun.com HQ: Usingen, GermanyReported employees: 11-50 | Usingen, Germany | 11-50 | Exact match | 26 contacts → |
“EasiRun is a European global provider of products, tools and solutions for software and software development with a focus on modernizing COBOL applications and development…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Tone Softwaretonesoft.com HQ: Orange, CA, United StatesReported employees: 51-200 | Orange, CA, United States | 51-200 | Exact match | 26 contacts → |
“TONE SOFTWARE CORPORATION is a high technology software development firm specializing in IT infrastructure management solutions for z/OS mainframes.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Raincoderaincode.com HQ: Brussels, BelgiumReported employees: 51-200 | Brussels, Belgium | 51-200 | Exact match | 25 contacts → |
“Raincode provides ASM370, COBOL & PL/I compilers and tools to migrate mainframe to.NET, Azure, LINUX.NETCore Having a COBOL or a PL/I past shouldn’t force you to build more COBOL…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | IBM Z Intellimagicibm.com HQ: Leiden, NetherlandsReported employees: 51-200 | Leiden, Netherlands | 51-200 | Exact match | 25 contacts → |
“IBM Z® IntelliMagic Vision for z/OS® is advanced performance analysis software for IBM Z.” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Select Business Solutionsselectbs.com HQ: Shelton, CT, United StatesReported employees: 51-200 | Shelton, CT, United States | 51-200 | Exact match | 25 contacts → |
“Select provides comprehensive solutions consisting of tools and services for information access and enterprise reporting, as well as business critical IT software development…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Trident Services INCtriserv.com HQ: Capitola, CA, United StatesReported employees: 11-50 | Capitola, CA, United States | 11-50 | Exact match | 22 contacts → |
“Since 1978, Trident Services has established a solid reputation for the excellence of its developed software, responsiveness of its support team and the expertise of its…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | GFS Softwaregfs.com.br HQ: São Paulo, BrazilReported employees: 51-200 | São Paulo, Brazil | 51-200 | Exact match | 21 contacts → |
“Com 35 anos de experiência no mercado, a GFS desenvolve softwares com alta confiabilidade e qualidade, os quais têm como diferencial a simplicidade de implantação, uso e…” Recorded description excerpt · October 19, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Mainframe application development software companies: dataset insights
October 19, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
263 records in the displayed employee bands.
2 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 265 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: October 19, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Mainframe application development software companies by location
1 lists · largest firstEvery Mainframe application development software companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for mainframe application development software companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many mainframe application development software companies did RevenueBase find worldwide?
The saved snapshot records 265 matching company records, 32,503 tracked contacts and 632 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: October 19, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 mainframe application development software companies worldwide. Snapshot: October 19, 2026. https://revenuebase.ai/companies/browse/mainframe-application-development-software-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗