Company lists · Data refreshed September 2026
Top 25 Open source software nonprofits based in the United States
RevenueBase identified 160 open source software nonprofits headquartered in the United States as of September 2026 and tracks 3,519 professional contacts across them, including 648 with verified work emails and 994 with mobile numbers. San Francisco is the largest hub.
This list covers open source software nonprofits headquartered in the United States, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
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 nonprofits based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,512 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | Meridian CooperativePartial evidence | 387 | |||
“Meridian Cooperative, fka SEDC, is a trusted leader in the development of innovative utility software and technology solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Hack4impact-UmdPartial evidence | 130 | |||
“Hack4Impact-UMD aims to leverage software by engaging students to promote social change.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | HerodevsStrong evidence | 105 | |||
“HeroDevs is the industry experts on “life after end-of-life” for open-source software.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 103 | ||||
“We killed software licensing fees.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 98 | ||||
“We help agencies improve lives through open software and thoughtful experiences.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | Open Source Initiative OSIStrong evidence | 56 | |||
“Open source is a development method for software that harnesses the power of distributed peer review and transparency of process.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Os4edPartial evidence | 45 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | PolicyengineStrong evidence | 32 | |||
“PolicyEngine is a nonprofit that provides free, open source software to compute the impact of public policy.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | MeedanStrong evidence | 31 | |||
“Meedan is a global technology nonprofit that builds software and programmatic initiatives to strengthen journalism, digital literacy, and accessibility of information online and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | Innersource Commons FoundationStrong evidence | 23 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Sahana Software FoundationStrong evidence | 18 | |||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 16 | ||||
“Equinox Open Library Initiative is a nonprofit company engaging in literary, charitable, and educational endeavors serving cultural and knowledge institutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 16 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 15 | ||||
“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: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | 14 | ||||
“Welcome to Drupal4Gov, a non-profit organization dedicated to connecting and serving government employees committed to open source technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 12 | ||||
“Code for Science & Society ("CSS") is a 501(c)(3) nonprofit organization.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | Nonadyne,incIndirect evidence | 12 | |||
“Nonadyne Inc was founded in 2013.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Open Source Hardware AssociationStrong evidence | 11 | |||
“The Open Source Hardware Association (OSHWA) aims to foster technological knowledge and encourage research that is accessible, collaborative and respects user freedom.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 10 | ||||
“Exaptive helps researchers and technologists working on a shared problem.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Open Library FoundationPartial evidence | 10 | |||
“The Open Library Foundation (the Foundation) was created in 2016 as an unbiased, independent not-for-profit organization designed to ensure the availability, accessibility and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Software In The Public Interest, INCStrong evidence | 9 | |||
“Software in the Public Interest is a non-profit organization which was founded to help organizations develop and distribute open hardware and software.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Spark Development NetworkIndirect evidence | 8 | |||
“The Spark Development Network (Spark) is an official 501(c)(3) non-profit organization that promotes collaboration, innovation and openness for church technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | RightgiftPartial evidence | 7 | |||
“RIghtGift is a technology company that builds free giving software for the charitable ecosystem.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Ruoom INCStrong evidence | 7 | |||
“Free open source code you can run and adapt.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 160 open source software nonprofits based in the United States
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Open source software nonprofits based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States 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.
- What we exclude
- Companies whose own description does not clearly place them among open source software nonprofits, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- 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 an evidence 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, 648 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 on September 5, 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.
Frequently asked
How many open source software nonprofits are there based in the United States?
RevenueBase identified 160 open source software nonprofits headquartered in the United States 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 city has the most open source software nonprofits?
San Francisco leads with 8 headquartered companies, followed by Austin (7) and Atlanta (6).
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 648 verified decision-maker contacts tracked across these 160 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.
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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.
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