Company lists · Data refreshed September 2026
Top 25 Open source software nonprofits worldwide
RevenueBase identified 379 open source software nonprofits worldwide as of September 2026 and tracks 5,854 professional contacts across them, including 817 with verified work emails and 1,128 with mobile numbers. The United States is the largest market and London the largest hub.
This list covers open source software nonprofits worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 5, 2026. Country and city lists for open source software nonprofits follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 nonprofits worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,512 contacts → | ||||
Strong evidence “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…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 387 contacts → | ||||
Partial evidence “Meridian Cooperative, fka SEDC, is a trusted leader in the development of innovative utility software and technology solutions.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 130 contacts → | ||||
Partial evidence “Hack4Impact-UMD aims to leverage software by engaging students to promote social change.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 105 contacts → | ||||
Strong evidence “HeroDevs is the industry experts on “life after end-of-life” for open-source software.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 103 contacts → | ||||
Partial evidence “We killed software licensing fees.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 98 contacts → | ||||
Strong evidence “We help agencies improve lives through open software and thoughtful experiences.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | 91 contacts → | ||||
Strong evidence “Frappe creates 100% open source software to help businesses grow sustainably.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 56 contacts → | ||||
Strong evidence “Open source is a development method for software that harnesses the power of distributed peer review and transparency of process.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 45 contacts → | ||||
Partial evidence “Open Solutions for Education (OS4Ed) is a provider of open solutions designed specifically to support the day to day management of schools and districts.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | 41 contacts → | ||||
Strong evidence “FOSS United Foundation is a registered non-profit founded in 2020, dedicated to the cause of building Free and Open Source (FOSS) projects and communities in India and elsewhere.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 34 contacts → | ||||
Partial evidence “Cytrion started in 2005 with a sole vision of making people's life easier by providing them affordable solutions through software.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 33 contacts → | ||||
Strong evidence “Lyra Infosystems is a trusted leader in enterprise open source solutions, dedicated to empowering businesses worldwide to thrive in today's dynamic digital landscape.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 32 contacts → | ||||
Strong evidence “PolicyEngine is a nonprofit that provides free, open source software to compute the impact of public policy.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 31 contacts → | ||||
Strong evidence “Meedan is a global technology nonprofit that builds software and programmatic initiatives to strengthen journalism, digital literacy, and accessibility of information online and…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 23 contacts → | ||||
Strong evidence “The InnerSource Commons Foundation is a community of industry professions and researchers founded to promote InnerSource - the application of Open Source principles and practices…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 20 contacts → | ||||
Indirect evidence “Dedicated to creating technology to make the world a better place.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 18 contacts → | ||||
Strong evidence “The Sahana Software Foundation was established as a 501(c)(3) non-profit organization to promote free and open source software solutions for disaster and emergency management.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 16 contacts → | ||||
Strong evidence “Equinox Open Library Initiative is a nonprofit company engaging in literary, charitable, and educational endeavors serving cultural and knowledge institutions.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 16 contacts → | ||||
Partial evidence “The core mission of the Apereo Foundation is to assist and facilitate educational organizations which collaborate to foster, develop, and sustain open technologies and innovation…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 16 contacts → | ||||
Strong evidence “Open Source start-up company based in centre Italy (Pescara), aiming to speed up the development and the adoption of Syncope Open Source IdM (http://incubator.apache.org/syncope/).” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 16 contacts → | ||||
Strong evidence “Welcome to OSMO Welcome to OSMO, the only IT consulting company in Central India providing fully FOSS (free and open source software) solutions!” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 15 contacts → | ||||
Strong evidence “DDI is a nonprofit software and technology cooperative focused on creating, supplying, and supporting innovative information management tools to partner in the missions of our…” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 15 contacts → | ||||
Strong evidence “Loco (short for Loohuis Consulting) is a company that is specialised in training, consultancy, hosting and software development revolving around Free and Open Source Software.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 14 contacts → | ||||
Strong evidence “Welcome to Drupal4Gov, a non-profit organization dedicated to connecting and serving government employees committed to open source technology.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | 12 contacts → | ||||
Partial evidence “Code for Science & Society ("CSS") is a 501(c)(3) nonprofit organization.” Source: RevenueBase Database · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: open source software nonprofits. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names open source software nonprofits.
- Partial evidence
- Its own public description names part of open source software nonprofits, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name open source software nonprofits. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 379 open source software nonprofits worldwide
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 817 reachable decision-makers.
Free signup · no credit card
Open source software nonprofits worldwide at a glance
As of Sep 5, 2026Companies by employee count
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among open source software nonprofits, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- 5 countries, largest first: the United States, India, the United Kingdom, the Netherlands, Italy. Country and city lists for open source software nonprofits are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “open source software nonprofits”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names open source software nonprofits), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among open source software nonprofits, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- 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 listed company carries at least one verified work email, 817 across the full list. 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 between September 5, 2026 and September 14, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Open source software nonprofits by location
5 lists · largest firstEvery Open source software nonprofits 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 Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names open source software nonprofits, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many open source software nonprofits are there worldwide?
RevenueBase identified 379 open source software nonprofits worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
The Apache Software Foundation, headquartered in Wilmington, tops this list with the largest team on record.
Which country has the most open source software nonprofits?
The United States leads with 160 companies, followed by India (123) and the United Kingdom (36). Every open source software nonprofits list by country and city is linked on this page.
Which city has the most open source software nonprofits?
London leads with 18 headquartered companies, followed by Chennai (11) and Mumbai (9).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 817 verified decision-maker contacts tracked across these 379 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 5, 2026 and September 14, 2026.
Ready to reach these companies? Verified emails and direct dials for all 379 open source software nonprofits worldwide. Start with a free account, no credit card.
Download this list →Related lists
Browse the directory
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 Smart Search, 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.