Company lists · Data refreshed November 2026
Top 25 Open-source software developers worldwide
RevenueBase identified 361 company matches for open-source software developers worldwide as of November 2026 and tracks 4,998 professional contacts across them, including 485 with verified work emails. The United States is the largest market and Pune the largest hub.
This list covers company matches for open-source software developers 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 5, 2026. Country and city lists for open-source software developers 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 software developers worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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 5, 2026 · View company records in RevenueBase | |||||
| 2 | 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 5, 2026 · View company records in RevenueBase | |||||
| 3 | 149 contacts → | ||||
Exact match “Notre Mission est depuis 20 ans, d’inventer et de développer les Logiciels Libres et Open Source éthiques (ce que nous appelons la « GoodTech ») pour participer à changer le Monde…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 123 contacts → | ||||
Exact match “Frappe creates 100% open source software to help businesses grow sustainably.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 42 contacts → | ||||
Exact match “Der Anspruch der synyx GmbH & Co.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 41 contacts → | ||||
Exact match “Ozgur Software Inc.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 37 contacts → | ||||
Exact match “Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 37 contacts → | ||||
Exact match “We are a not-for-profit organization focused on open source software development, innovation and education.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 26 contacts → | ||||
Exact match “Obsidian Systems is an established supplier of Open Source software solutions.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 21 contacts → | ||||
Exact match “We develop software using an open, transparent and mutualistic approach.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 19 contacts → | ||||
Exact match “Red Hat's purpose is to be the catalyst in communities of customers, contributors, and Partners creating better technology in the Open Source Way.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 17 contacts → | ||||
Exact match “Eydean builds the most powerful and flexible tools for modern businesses.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 16 contacts → | ||||
Exact match “VA Linux Systems Japan (VA Linux) OS (Linux Kernel OS )() OSS OSS VA Linux VA Linux OSS VA Linux OSS OSS VA Linux OSS VA Linux VA Linux OSS OSS VA Linux (VA Quest) OSS OSS OSS…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 13 contacts → | ||||
Exact match “Spécialistes du développement Open Source (PHP, Javascript) Cloud et OPS / Associé Time For The Planet et certifié Great Place To Work” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 12 contacts → | ||||
Exact match “We are a technology-based cooperative organization specialized in Free Software, founded in 2013 by systems engineers, programmers and design professionals that allow us to work…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 11 contacts → | ||||
Exact match “Unison Computing is a Delaware public benefit corp.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 11 contacts → | ||||
Exact match “ECC Digital baut Open-Source-Software, die nach dem Projekt nicht im Regal landet.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 11 contacts → | ||||
Exact match “Nonadyne Inc was founded in 2013.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 9 contacts → | ||||
Exact match “Our business philosophy is based upon getting the best out of free and open source software.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 8 contacts → | ||||
Exact match “Freemake is an IT company, with teams working worldwide.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 7 contacts → | ||||
Exact match “Our Open-Source is part of our company.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 7 contacts → | ||||
Exact match “Zajmujemy się wytwarzaniem i utrzymaniem oprogramowania.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 6 contacts → | ||||
Exact match “O GLUA, Grupo Linux da Universidade de Aveiro, é um grupo integrado no Departamento de Eletrónica, Telecomunicações e Informática (DETI) que tem como objetivo divulgar e promover…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 6 contacts → | ||||
Exact match “Sviluppo di soluzioni basate su Software Open Source che meglio si adattano alle varie esigenze; per non rimanere ad fermo ad aspettare.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 6 contacts → | ||||
Exact match “Buffetti è il leader italiano della distribuzione di prodotti, servizi software e soluzioni informatiche rivolti principalmente al mercato dei professionisti, artigiani…” Recorded in the RevenueBase company graph · Nov 5, 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 software developers”. 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 361 open-source software developers worldwide
See the full list, filter by size, metro and specialty, and access 485 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Open-source software developers worldwide at a glance
As of Nov 5, 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 software developers are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “open-source software developers” 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 485 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 5, 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 software developers by location
1 lists · largest firstEvery Open-source software developers 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 “open-source software developers”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many open-source software developers are there worldwide?
RevenueBase identified 361 company matches for open-source software developers 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?
The Apache Software Foundation tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most open-source software developers?
The United States leads with 51 companies. Every open-source software developers list by country and city is linked on this page.
Which city has the most open-source software developers?
Pune leads with 5 company records, followed by London (4) and Los Angeles (4).
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 485 professional contacts with verified work emails tracked across these 361 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 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 361 open-source software developers 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 software developers worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 361 matching company records for open-source software developers worldwide, with 4,998 tracked contacts and 485 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 5, 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 software developers 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 |  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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Linagoralinagora.comHQ: Issy-les-moulineaux, FranceReported employees: 201-500 | Issy-les-moulineaux, France | 201-500 | Exact match | 149 contacts → |
“Notre Mission est depuis 20 ans, d’inventer et de développer les Logiciels Libres et Open Source éthiques (ce que nous appelons la « GoodTech ») pour participer à changer le Monde…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  Synyx Gmbh & Co. KGsynyx.deHQ: Karlsruhe, GermanyReported employees: 51-200 | Karlsruhe, Germany | 51-200 | Exact match | 42 contacts → |
“Der Anspruch der synyx GmbH & Co.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Özgür Yazılım A.Şozguryazilim.com.trHQ: İstanbul, TürkiyeReported employees: 11-50 | İstanbul, Türkiye | 11-50 | Exact match | 41 contacts → |
“Ozgur Software Inc.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Lyra Infosystemslyrainfo.comHQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 37 contacts → |
“Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Aossieaossie.orgHQ: Canberra, AustraliaReported employees: 11-50 | Canberra, Australia | 11-50 | Exact match | 37 contacts → |
“We are a not-for-profit organization focused on open source software development, innovation and education.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Obsidian Systemsobsidian.co.zaHQ: Randburg, South AfricaReported employees: 51-200 | Randburg, South Africa | 51-200 | Exact match | 26 contacts → |
“Obsidian Systems is an established supplier of Open Source software solutions.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Velocity Cubedvelocitycubed.co.zaHQ: Johannesburg, South AfricaReported employees: 11-50 | Johannesburg, South Africa | 11-50 | Exact match | 21 contacts → |
“We develop software using an open, transparent and mutualistic approach.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Health Access Solutionsredhat.comHQ: San Francisco, CA, United StatesReported employees: Not recorded | San Francisco, CA, United States | Not recorded | Exact match | 19 contacts → |
“Red Hat's purpose is to be the catalyst in communities of customers, contributors, and Partners creating better technology in the Open Source Way.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Eydean INCeydean.comHQ: Kathmandu, NepalReported employees: 51-200 | Kathmandu, Nepal | 51-200 | Exact match | 17 contacts → |
“Eydean builds the most powerful and flexible tools for modern businesses.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  VA Linux Systems Japan株式会社valinux.co.jpHQ: 江東区, JapanReported employees: 11-50 | 江東区, Japan | 11-50 | Exact match | 16 contacts → |
“VA Linux Systems Japan (VA Linux) OS (Linux Kernel OS )() OSS OSS VA Linux VA Linux OSS VA Linux OSS OSS VA Linux OSS VA Linux VA Linux OSS OSS VA Linux (VA Quest) OSS OSS OSS…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Yomevayomeva.comHQ: Paris, FranceReported employees: 11-50 | Paris, France | 11-50 | Exact match | 13 contacts → |
“Spécialistes du développement Open Source (PHP, Javascript) Cloud et OPS / Associé Time For The Planet et certifié Great Place To Work” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Geneosgeneos.com.arHQ: Tandil, ArgentinaReported employees: 11-50 | Tandil, Argentina | 11-50 | Exact match | 12 contacts → |
“We are a technology-based cooperative organization specialized in Free Software, founded in 2013 by systems engineers, programmers and design professionals that allow us to work…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Unison Computingunison.cloudHQ: Somerville, MA, United StatesReported employees: 1-10 | Somerville, MA, United States | 1-10 | Exact match | 11 contacts → |
“Unison Computing is a Delaware public benefit corp.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  ECC Digitalecc-digital.deHQ: Kiel, GermanyReported employees: 11-50 | Kiel, Germany | 11-50 | Exact match | 11 contacts → |
“ECC Digital baut Open-Source-Software, die nach dem Projekt nicht im Regal landet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Nonadyne,incnonadyne.comHQ: Wixom, MI, United StatesReported employees: 1-10 | Wixom, MI, United States | 1-10 | Exact match | 11 contacts → |
“Nonadyne Inc was founded in 2013.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 |  PRO Media ARTpromediaart.comHQ: Kolkata, IndiaReported employees: 1-10 | Kolkata, India | 1-10 | Exact match | 9 contacts → |
“Our business philosophy is based upon getting the best out of free and open source software.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Freemakefreemake.comHQ: United StatesReported employees: 11-50 | United States | 11-50 | Exact match | 8 contacts → |
“Freemake is an IT company, with teams working worldwide.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Cinovo AGcinovo.deHQ: Stuttgart, GermanyReported employees: 1-10 | Stuttgart, Germany | 1-10 | Exact match | 7 contacts → |
“Our Open-Source is part of our company.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Nice Code Sp. Z O.Onice-code.comHQ: United StatesReported employees: 1-10 | United States | 1-10 | Exact match | 7 contacts → |
“Zajmujemy się wytwarzaniem i utrzymaniem oprogramowania.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  GLUAglua.ua.ptHQ: Aveiro, PortugalReported employees: 11-50 | Aveiro, Portugal | 11-50 | Exact match | 6 contacts → |
“O GLUA, Grupo Linux da Universidade de Aveiro, é um grupo integrado no Departamento de Eletrónica, Telecomunicações e Informática (DETI) que tem como objetivo divulgar e promover…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  BE Smart BE Openbesmartbeopen.itHQ: San Giuliano Terme, ItalyReported employees: 1-10 | San Giuliano Terme, Italy | 1-10 | Exact match | 6 contacts → |
“Sviluppo di soluzioni basate su Software Open Source che meglio si adattano alle varie esigenze; per non rimanere ad fermo ad aspettare.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Buffetti Software ABI Salernosoftwaresalerno.comHQ: Salerno, ItalyReported employees: 1-10 | Salerno, Italy | 1-10 | Exact match | 6 contacts → |
“Buffetti è il leader italiano della distribuzione di prodotti, servizi software e soluzioni informatiche rivolti principalmente al mercato dei professionisti, artigiani…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 361 company matches
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Open-source software developers: dataset insights
November 5, 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
358 records in the displayed employee bands.
3 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 361 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 5, 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 software developers by location
1 lists · largest firstEvery Open-source software developers 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 open-source software developers?
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 software developers did RevenueBase find worldwide?
The saved snapshot records 361 matching company records, 4,998 tracked contacts and 485 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 5, 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 software developers worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/open-source-software-developers.
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 software developers worldwide
RevenueBase records 361 matching company records for open-source software developers worldwide, with 4,998 tracked contacts and 485 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 5, 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 software developers 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 | 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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | 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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Linagoralinagora.com HQ: Issy-les-moulineaux, FranceReported employees: 201-500 | Issy-les-moulineaux, France | 201-500 | Exact match | 149 contacts → |
“Notre Mission est depuis 20 ans, d’inventer et de développer les Logiciels Libres et Open Source éthiques (ce que nous appelons la « GoodTech ») pour participer à changer le Monde…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | 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 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | Synyx Gmbh & Co. KGsynyx.de HQ: Karlsruhe, GermanyReported employees: 51-200 | Karlsruhe, Germany | 51-200 | Exact match | 42 contacts → |
“Der Anspruch der synyx GmbH & Co.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Özgür Yazılım A.Şozguryazilim.com.tr HQ: İstanbul, TürkiyeReported employees: 11-50 | İstanbul, Türkiye | 11-50 | Exact match | 41 contacts → |
“Ozgur Software Inc.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Lyra Infosystemslyrainfo.com HQ: Bangalore, IndiaReported employees: 51-200 | Bangalore, India | 51-200 | Exact match | 37 contacts → |
“Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Aossieaossie.org HQ: Canberra, AustraliaReported employees: 11-50 | Canberra, Australia | 11-50 | Exact match | 37 contacts → |
“We are a not-for-profit organization focused on open source software development, innovation and education.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Obsidian Systemsobsidian.co.za HQ: Randburg, South AfricaReported employees: 51-200 | Randburg, South Africa | 51-200 | Exact match | 26 contacts → |
“Obsidian Systems is an established supplier of Open Source software solutions.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Velocity Cubedvelocitycubed.co.za HQ: Johannesburg, South AfricaReported employees: 11-50 | Johannesburg, South Africa | 11-50 | Exact match | 21 contacts → |
“We develop software using an open, transparent and mutualistic approach.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Health Access Solutionsredhat.com HQ: San Francisco, CA, United StatesReported employees: Not recorded | San Francisco, CA, United States | Not recorded | Exact match | 19 contacts → |
“Red Hat's purpose is to be the catalyst in communities of customers, contributors, and Partners creating better technology in the Open Source Way.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Eydean INCeydean.com HQ: Kathmandu, NepalReported employees: 51-200 | Kathmandu, Nepal | 51-200 | Exact match | 17 contacts → |
“Eydean builds the most powerful and flexible tools for modern businesses.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | VA Linux Systems Japan株式会社valinux.co.jp HQ: 江東区, JapanReported employees: 11-50 | 江東区, Japan | 11-50 | Exact match | 16 contacts → |
“VA Linux Systems Japan (VA Linux) OS (Linux Kernel OS )() OSS OSS VA Linux VA Linux OSS VA Linux OSS OSS VA Linux OSS VA Linux VA Linux OSS OSS VA Linux (VA Quest) OSS OSS OSS…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Yomevayomeva.com HQ: Paris, FranceReported employees: 11-50 | Paris, France | 11-50 | Exact match | 13 contacts → |
“Spécialistes du développement Open Source (PHP, Javascript) Cloud et OPS / Associé Time For The Planet et certifié Great Place To Work” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Geneosgeneos.com.ar HQ: Tandil, ArgentinaReported employees: 11-50 | Tandil, Argentina | 11-50 | Exact match | 12 contacts → |
“We are a technology-based cooperative organization specialized in Free Software, founded in 2013 by systems engineers, programmers and design professionals that allow us to work…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Unison Computingunison.cloud HQ: Somerville, MA, United StatesReported employees: 1-10 | Somerville, MA, United States | 1-10 | Exact match | 11 contacts → |
“Unison Computing is a Delaware public benefit corp.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | ECC Digitalecc-digital.de HQ: Kiel, GermanyReported employees: 11-50 | Kiel, Germany | 11-50 | Exact match | 11 contacts → |
“ECC Digital baut Open-Source-Software, die nach dem Projekt nicht im Regal landet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Nonadyne,incnonadyne.com HQ: Wixom, MI, United StatesReported employees: 1-10 | Wixom, MI, United States | 1-10 | Exact match | 11 contacts → |
“Nonadyne Inc was founded in 2013.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | PRO Media ARTpromediaart.com HQ: Kolkata, IndiaReported employees: 1-10 | Kolkata, India | 1-10 | Exact match | 9 contacts → |
“Our business philosophy is based upon getting the best out of free and open source software.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Freemakefreemake.com HQ: United StatesReported employees: 11-50 | United States | 11-50 | Exact match | 8 contacts → |
“Freemake is an IT company, with teams working worldwide.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Cinovo AGcinovo.de HQ: Stuttgart, GermanyReported employees: 1-10 | Stuttgart, Germany | 1-10 | Exact match | 7 contacts → |
“Our Open-Source is part of our company.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Nice Code Sp. Z O.Onice-code.com HQ: United StatesReported employees: 1-10 | United States | 1-10 | Exact match | 7 contacts → |
“Zajmujemy się wytwarzaniem i utrzymaniem oprogramowania.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | GLUAglua.ua.pt HQ: Aveiro, PortugalReported employees: 11-50 | Aveiro, Portugal | 11-50 | Exact match | 6 contacts → |
“O GLUA, Grupo Linux da Universidade de Aveiro, é um grupo integrado no Departamento de Eletrónica, Telecomunicações e Informática (DETI) que tem como objetivo divulgar e promover…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | BE Smart BE Openbesmartbeopen.it HQ: San Giuliano Terme, ItalyReported employees: 1-10 | San Giuliano Terme, Italy | 1-10 | Exact match | 6 contacts → |
“Sviluppo di soluzioni basate su Software Open Source che meglio si adattano alle varie esigenze; per non rimanere ad fermo ad aspettare.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Buffetti Software ABI Salernosoftwaresalerno.com HQ: Salerno, ItalyReported employees: 1-10 | Salerno, Italy | 1-10 | Exact match | 6 contacts → |
“Buffetti è il leader italiano della distribuzione di prodotti, servizi software e soluzioni informatiche rivolti principalmente al mercato dei professionisti, artigiani…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 361 company matches
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Open-source software developers: dataset insights
November 5, 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
358 records in the displayed employee bands.
3 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 361 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 5, 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 software developers by location
1 lists · largest firstEvery Open-source software developers 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 open-source software developers?
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 software developers did RevenueBase find worldwide?
The saved snapshot records 361 matching company records, 4,998 tracked contacts and 485 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 5, 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 software developers worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/open-source-software-developers.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗