Company lists · Data refreshed November 2026
Top 25 Open source development firms worldwide
RevenueBase identified 1,561 company matches for open source development firms worldwide as of November 2026 and tracks 40,335 professional contacts across them, including 14,769 with verified work emails. The United States is the largest market and London the largest hub.
This list covers company matches for open source development firms 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 November 6, 2026. Country and city lists for open source development firms 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 open source development firms worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 25,149 contacts → | ||||
Exact match “Red Hat is the world’s leading provider of enterprise open source solutions, using a community-powered approach to deliver high-performing Linux, hybrid cloud, edge, and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 2 | 1,207 contacts → | ||||
Exact match “The Apache Software Foundation (ASF) is the global home for open source software, powering some of the world’s most ubiquitous software projects including Apache Airflow, Apache…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 3 | 866 contacts → | ||||
Exact match “The Linux Foundation is the organization of choice for the world's top developers and companies to build ecosystems that accelerate open technology development and commercial…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 4 | 666 contacts → | ||||
Exact match “Webkul is one of the largest self-created open-source marketplaces in the world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 5 | 378 contacts → | ||||
Exact match “Altamira Technologies, a Parsons Company, is a top open source technology company in the national security space.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 6 | 374 contacts → | ||||
Exact match “We are a team of engineers with strong technical know-how, and we enjoy complicated, unconventional projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 7 | 206 contacts → | ||||
Exact match “Keen & Able Computers Pvt Ltd was established in 1996 as Open Source movement was just beginning to take shape.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 8 | 132 contacts → | ||||
Exact match “Adfinis is a leading provider of open source IT solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 9 | 123 contacts → | ||||
Exact match “Frappe creates 100% open source software to help businesses grow sustainably.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 10 | 122 contacts → | ||||
Exact match “Synergetica is a software R&D experts community working together since the year of Our community grows delivering the next generation software to our customers worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 11 | 116 contacts → | ||||
Exact match “Collabora is a global consultancy specializing in delivering the benefits of Open Source software to the commercial world.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 12 | 115 contacts → | ||||
Exact match “The Invento Labs outsourcing company is a team of experts who develop and deploy open source IT solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 13 | 110 contacts → | ||||
Exact match “NCS is leading Product Development, Custom Software Development and IT resourcing company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 14 | 95 contacts → | ||||
Exact match “The Coding Machine is an IT company that provides bespoke web & mobile development.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 15 | 95 contacts → | ||||
Exact match “Irontec es una empresa ubicada en Bilbao, en un centro empresarial con gran presencia de empresas tecnológicas a orillas de la ría del Nervión.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 16 | 94 contacts → | ||||
Exact match “Proxy is a leading IT service provider with a strong focus on Open Source Technology.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 17 | 93 contacts → | ||||
Exact match “CodeChem is one of the most innovative software development companies based in Macedonia, Germany, and Canada.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 18 | 85 contacts → | ||||
Exact match “JUXT joins forces with Grid Dynamics, JUXT is a cutting-edge software consultancy that delivers innovation to large enterprises and high-performing organisations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 19 | 77 contacts → | ||||
Exact match “Web and mobile development, consulting, expertise, or training.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 20 | 77 contacts → | ||||
Exact match “Zestbrains pvt ltd is a Leading software development company based in India catering to the enterprise solutions worldwide.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 21 | 76 contacts → | ||||
Exact match “TenthPlanet Technologies brings over 20 years of hands-on experience in delivering enterprise-ready open source IT solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 22 | 70 contacts → | ||||
Exact match “Savoir-faire Linux® is an outstanding team of 50 Free Software consultants based in Montreal and Rennes.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 23 | 69 contacts → | ||||
Exact match “ATS Global Techsoft Pvt Ltd is a Software Solutions Company based in Bangalore the Silicon Valley of India.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 24 | 67 contacts → | ||||
Exact match “Contribute to the best open-source projects.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase | |||||
| 25 | 66 contacts → | ||||
Exact match “Working with Inuits means entering into a partnership with a focus on technological innovation.” Recorded in the RevenueBase company graph · Nov 6, 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 “open source development firms”. 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 1,561 open source development firms worldwide
See the full list, filter by size, metro and specialty, and access 14,769 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Open source development firms worldwide at a glance
As of Nov 6, 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 open source development firms are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “open source development firms” 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 14,769 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 November 6, 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.
Open source development firms by location
8 lists · largest firstEvery Open source development firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Open source development firms based in the United States210
- Open source development firms based in India167
- Open source development firms based in France81
- Open source development firms based in the United Kingdom56
- Open source development firms based in the Netherlands55
- Open source development firms based in Germany47
- Open source development firms based in Spain44
- Open source development firms based in Italy37
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 “open source development firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many open source development firms are there worldwide?
RevenueBase identified 1,561 company matches for open source development firms worldwide as of November 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?
RED HAT tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most open source development firms?
The United States leads with 210 companies, followed by India (167) and France (81). Every open source development firms list by country and city is linked on this page.
Which city has the most open source development firms?
London leads with 22 company records, followed by Paris (19) and Bangalore (13).
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 14,769 professional contacts with verified work emails tracked across these 1,561 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 November 6, 2026.
Ready to reach these companies? Verified emails and direct dials for all 1,561 open source development firms 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 open source development firms worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 1,561 matching company records for open source development firms worldwide, with 40,335 tracked contacts and 14,769 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: November 6, 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 open source development firms 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 |  RED HATredhat.comHQ: Raleigh, NC, United StatesReported employees: 10001+ | Raleigh, NC, United States | 10001+ | Exact match | 25,149 contacts → |
“Red Hat is the world’s leading provider of enterprise open source solutions, using a community-powered approach to deliver high-performing Linux, hybrid cloud, edge, and…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  The Apache Software Foundationapache.orgHQ: Wilmington, DE, United StatesReported employees: 5,001-10,000 | Wilmington, DE, United States | 5,001-10,000 | Exact match | 1,207 contacts → |
“The Apache Software Foundation (ASF) is the global home for open source software, powering some of the world’s most ubiquitous software projects including Apache Airflow, Apache…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  The Linux Foundationlinuxfoundation.orgHQ: San Francisco, CA, United StatesReported employees: 201-500 | San Francisco, CA, United States | 201-500 | Exact match | 866 contacts → |
“The Linux Foundation is the organization of choice for the world's top developers and companies to build ecosystems that accelerate open technology development and commercial…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  Webkulwebkul.comHQ: Noida, IndiaReported employees: 501-1,000 | Noida, India | 501-1,000 | Exact match | 666 contacts → |
“Webkul is one of the largest self-created open-source marketplaces in the world.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Altamira Technologies Corporationaltamiracorp.comHQ: Mclean, MD, United StatesReported employees: 501-1,000 | Mclean, MD, United States | 501-1,000 | Exact match | 378 contacts → |
“Altamira Technologies, a Parsons Company, is a top open source technology company in the national security space.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Software Mansionswmansion.comHQ: Kraków, PolandReported employees: 201-500 | Kraków, Poland | 201-500 | Exact match | 374 contacts → |
“We are a team of engineers with strong technical know-how, and we enjoy complicated, unconventional projects.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Keen & Able Computers PVT LTDkeenable.inHQ: Noida, IndiaReported employees: 51-200 | Noida, India | 51-200 | Exact match | 206 contacts → |
“Keen & Able Computers Pvt Ltd was established in 1996 as Open Source movement was just beginning to take shape.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Adfinisadfinis.comHQ: Bern, SwitzerlandReported employees: 51-200 | Bern, Switzerland | 51-200 | Exact match | 132 contacts → |
“Adfinis is a leading provider of open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Frappefrappe.ioHQ: Mumbai, IndiaReported employees: 51-200 | Mumbai, India | 51-200 | Exact match | 123 contacts → |
“Frappe creates 100% open source software to help businesses grow sustainably.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Synergeticasynergetica.coHQ: Warsaw, VA, PolandReported employees: 201-500 | Warsaw, VA, Poland | 201-500 | Exact match | 122 contacts → |
“Synergetica is a software R&D experts community working together since the year of Our community grows delivering the next generation software to our customers worldwide.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Collaboracollabora.comHQ: Cambridge, United KingdomReported employees: 51-200 | Cambridge, United Kingdom | 51-200 | Exact match | 116 contacts → |
“Collabora is a global consultancy specializing in delivering the benefits of Open Source software to the commercial world.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Invento Labsinvento-labs.comHQ: Minsk, BelarusReported employees: 51-200 | Minsk, Belarus | 51-200 | Exact match | 115 contacts → |
“The Invento Labs outsourcing company is a team of experts who develop and deploy open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Nenosystems Consulting Services PVT LTDnenosystems.comHQ: Indore, IndiaReported employees: 51-200 | Indore, India | 51-200 | Exact match | 110 contacts → |
“NCS is leading Product Development, Custom Software Development and IT resourcing company.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  The Codingmachinethecodingmachine.comHQ: Paris, FranceReported employees: 51-200 | Paris, France | 51-200 | Exact match | 95 contacts → |
“The Coding Machine is an IT company that provides bespoke web & mobile development.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Irontecirontec.comHQ: Bilbao, SpainReported employees: 51-200 | Bilbao, Spain | 51-200 | Exact match | 95 contacts → |
“Irontec es una empresa ubicada en Bilbao, en un centro empresarial con gran presencia de empresas tecnológicas a orillas de la ría del Nervión.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Proxy Services B.Vproxy.nlHQ: Rotterdam, NetherlandsReported employees: 51-200 | Rotterdam, Netherlands | 51-200 | Exact match | 94 contacts → |
“Proxy is a leading IT service provider with a strong focus on Open Source Technology.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Codechem INCcodechem.com HQ: Montreal, CanadaReported employees: 51-200 | Montreal, Canada | 51-200 | Exact match | 93 contacts → |
“CodeChem is one of the most innovative software development companies based in Macedonia, Germany, and Canada.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  JUXTjuxt.proHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 85 contacts → |
“JUXT joins forces with Grid Dynamics, JUXT is a cutting-edge software consultancy that delivers innovation to large enterprises and high-performing organisations.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  les-tilleuls.cooples-tilleuls.coopHQ: Lille, FranceReported employees: 51-200 | Lille, France | 51-200 | Exact match | 77 contacts → |
“Web and mobile development, consulting, expertise, or training.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Zestbrains Pvt. LTDzestbrains.comHQ: Ahmedabad, IndiaReported employees: 51-200 | Ahmedabad, India | 51-200 | Exact match | 77 contacts → |
“Zestbrains pvt ltd is a Leading software development company based in India catering to the enterprise solutions worldwide.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Tenthplanet Technologiestenthplanet.inHQ: Chennai, IndiaReported employees: 51-200 | Chennai, India | 51-200 | Exact match | 76 contacts → |
“TenthPlanet Technologies brings over 20 years of hands-on experience in delivering enterprise-ready open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Savoir-Faire Linuxsavoirfairelinux.comHQ: Montréal, CanadaReported employees: 51-200 | Montréal, Canada | 51-200 | Exact match | 70 contacts → |
“Savoir-faire Linux® is an outstanding team of 50 Free Software consultants based in Montreal and Rennes.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  ATS Global Techsoft PVT LTDatsglobal.inHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 69 contacts → |
“ATS Global Techsoft Pvt Ltd is a Software Solutions Company based in Bangalore the Silicon Valley of India.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Only Dustonlydust.xyzHQ: United StatesReported employees: 11-50 | United States | 11-50 | Exact match | 67 contacts → |
“Contribute to the best open-source projects.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Inuitsinuits.euHQ: Brasschaat, BelgiumReported employees: 51-200 | Brasschaat, Belgium | 51-200 | Exact match | 66 contacts → |
“Working with Inuits means entering into a partnership with a focus on technological innovation.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 1,561 company matches
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Open source development firms: dataset insights
November 6, 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
1,552 records in the displayed employee bands.
9 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 1,561 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: November 6, 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 ↗
Open source development firms by location
8 lists · largest firstEvery Open source development firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Open source development firms based in the United States210
- Open source development firms based in India167
- Open source development firms based in France81
- Open source development firms based in the United Kingdom56
- Open source development firms based in the Netherlands55
- Open source development firms based in Germany47
- Open source development firms based in Spain44
- Open source development firms based in Italy37
Questions about this company list
What does Exact match mean for open source development firms?
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 open source development firms did RevenueBase find worldwide?
The saved snapshot records 1,561 matching company records, 40,335 tracked contacts and 14,769 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: November 6, 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.
Related lists
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Cite this list
RevenueBase Data Team. Top 25 open source development firms worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/open-source-development-firms.
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 open source development firms worldwide
RevenueBase records 1,561 matching company records for open source development firms worldwide, with 40,335 tracked contacts and 14,769 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: November 6, 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 open source development firms 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 | RED HATredhat.com HQ: Raleigh, NC, United StatesReported employees: 10001+ | Raleigh, NC, United States | 10001+ | Exact match | 25,149 contacts → |
“Red Hat is the world’s leading provider of enterprise open source solutions, using a community-powered approach to deliver high-performing Linux, hybrid cloud, edge, and…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | The Apache Software Foundationapache.org HQ: Wilmington, DE, United StatesReported employees: 5,001-10,000 | Wilmington, DE, United States | 5,001-10,000 | Exact match | 1,207 contacts → |
“The Apache Software Foundation (ASF) is the global home for open source software, powering some of the world’s most ubiquitous software projects including Apache Airflow, Apache…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | The Linux Foundationlinuxfoundation.org HQ: San Francisco, CA, United StatesReported employees: 201-500 | San Francisco, CA, United States | 201-500 | Exact match | 866 contacts → |
“The Linux Foundation is the organization of choice for the world's top developers and companies to build ecosystems that accelerate open technology development and commercial…” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | Webkulwebkul.com HQ: Noida, IndiaReported employees: 501-1,000 | Noida, India | 501-1,000 | Exact match | 666 contacts → |
“Webkul is one of the largest self-created open-source marketplaces in the world.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Altamira Technologies Corporationaltamiracorp.com HQ: Mclean, MD, United StatesReported employees: 501-1,000 | Mclean, MD, United States | 501-1,000 | Exact match | 378 contacts → |
“Altamira Technologies, a Parsons Company, is a top open source technology company in the national security space.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Software Mansionswmansion.com HQ: Kraków, PolandReported employees: 201-500 | Kraków, Poland | 201-500 | Exact match | 374 contacts → |
“We are a team of engineers with strong technical know-how, and we enjoy complicated, unconventional projects.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Keen & Able Computers PVT LTDkeenable.in HQ: Noida, IndiaReported employees: 51-200 | Noida, India | 51-200 | Exact match | 206 contacts → |
“Keen & Able Computers Pvt Ltd was established in 1996 as Open Source movement was just beginning to take shape.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Adfinisadfinis.com HQ: Bern, SwitzerlandReported employees: 51-200 | Bern, Switzerland | 51-200 | Exact match | 132 contacts → |
“Adfinis is a leading provider of open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Frappefrappe.io HQ: Mumbai, IndiaReported employees: 51-200 | Mumbai, India | 51-200 | Exact match | 123 contacts → |
“Frappe creates 100% open source software to help businesses grow sustainably.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Synergeticasynergetica.co HQ: Warsaw, VA, PolandReported employees: 201-500 | Warsaw, VA, Poland | 201-500 | Exact match | 122 contacts → |
“Synergetica is a software R&D experts community working together since the year of Our community grows delivering the next generation software to our customers worldwide.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Collaboracollabora.com HQ: Cambridge, United KingdomReported employees: 51-200 | Cambridge, United Kingdom | 51-200 | Exact match | 116 contacts → |
“Collabora is a global consultancy specializing in delivering the benefits of Open Source software to the commercial world.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Invento Labsinvento-labs.com HQ: Minsk, BelarusReported employees: 51-200 | Minsk, Belarus | 51-200 | Exact match | 115 contacts → |
“The Invento Labs outsourcing company is a team of experts who develop and deploy open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Nenosystems Consulting Services PVT LTDnenosystems.com HQ: Indore, IndiaReported employees: 51-200 | Indore, India | 51-200 | Exact match | 110 contacts → |
“NCS is leading Product Development, Custom Software Development and IT resourcing company.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | The Codingmachinethecodingmachine.com HQ: Paris, FranceReported employees: 51-200 | Paris, France | 51-200 | Exact match | 95 contacts → |
“The Coding Machine is an IT company that provides bespoke web & mobile development.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Irontecirontec.com HQ: Bilbao, SpainReported employees: 51-200 | Bilbao, Spain | 51-200 | Exact match | 95 contacts → |
“Irontec es una empresa ubicada en Bilbao, en un centro empresarial con gran presencia de empresas tecnológicas a orillas de la ría del Nervión.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Proxy Services B.Vproxy.nl HQ: Rotterdam, NetherlandsReported employees: 51-200 | Rotterdam, Netherlands | 51-200 | Exact match | 94 contacts → |
“Proxy is a leading IT service provider with a strong focus on Open Source Technology.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Codechem INCcodechem.com HQ: Montreal, CanadaReported employees: 51-200 | Montreal, Canada | 51-200 | Exact match | 93 contacts → |
“CodeChem is one of the most innovative software development companies based in Macedonia, Germany, and Canada.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | JUXTjuxt.pro HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 85 contacts → |
“JUXT joins forces with Grid Dynamics, JUXT is a cutting-edge software consultancy that delivers innovation to large enterprises and high-performing organisations.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | les-tilleuls.cooples-tilleuls.coop HQ: Lille, FranceReported employees: 51-200 | Lille, France | 51-200 | Exact match | 77 contacts → |
“Web and mobile development, consulting, expertise, or training.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Zestbrains Pvt. LTDzestbrains.com HQ: Ahmedabad, IndiaReported employees: 51-200 | Ahmedabad, India | 51-200 | Exact match | 77 contacts → |
“Zestbrains pvt ltd is a Leading software development company based in India catering to the enterprise solutions worldwide.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Tenthplanet Technologiestenthplanet.in HQ: Chennai, IndiaReported employees: 51-200 | Chennai, India | 51-200 | Exact match | 76 contacts → |
“TenthPlanet Technologies brings over 20 years of hands-on experience in delivering enterprise-ready open source IT solutions.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Savoir-Faire Linuxsavoirfairelinux.com HQ: Montréal, CanadaReported employees: 51-200 | Montréal, Canada | 51-200 | Exact match | 70 contacts → |
“Savoir-faire Linux® is an outstanding team of 50 Free Software consultants based in Montreal and Rennes.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | ATS Global Techsoft PVT LTDatsglobal.in HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 69 contacts → |
“ATS Global Techsoft Pvt Ltd is a Software Solutions Company based in Bangalore the Silicon Valley of India.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Only Dustonlydust.xyz HQ: United StatesReported employees: 11-50 | United States | 11-50 | Exact match | 67 contacts → |
“Contribute to the best open-source projects.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Inuitsinuits.eu HQ: Brasschaat, BelgiumReported employees: 51-200 | Brasschaat, Belgium | 51-200 | Exact match | 66 contacts → |
“Working with Inuits means entering into a partnership with a focus on technological innovation.” Recorded description excerpt · November 6, 2026Open company data in RevenueBase ↗Free signup required. | |||||
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Open source development firms: dataset insights
November 6, 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
1,552 records in the displayed employee bands.
9 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 1,561 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: November 6, 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 ↗
Open source development firms by location
8 lists · largest firstEvery Open source development firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Open source development firms based in the United States210
- Open source development firms based in India167
- Open source development firms based in France81
- Open source development firms based in the United Kingdom56
- Open source development firms based in the Netherlands55
- Open source development firms based in Germany47
- Open source development firms based in Spain44
- Open source development firms based in Italy37
Questions about this company list
What does Exact match mean for open source development firms?
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 open source development firms did RevenueBase find worldwide?
The saved snapshot records 1,561 matching company records, 40,335 tracked contacts and 14,769 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: November 6, 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 open source development firms worldwide. Snapshot: November 6, 2026. https://revenuebase.ai/companies/browse/open-source-development-firms.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗