
The Apache Software Foundation (ASF) is an American nonprofit corporation to support Apache software projects, including the Apache HTTP Server. The ASF was formed from the Apache Group and incorporated on March 25, 1999.

Benetech is a nonprofit social enterprise organization that empowers communities with software for social good. Previous projects include the Route 66 Literacy Project, the Miradi environmental project management software, Martus, and the Human Rights Data Analysis Group. Current program areas include global education, human rights, and poverty alleviation.

Comunes is a nonprofit organization aiming to encourage the commons and facilitating grassroots work through free software web tools. Previously known as Ourproject.org, this collective established itself as a legal entity in 2009, forming Comunes. Nowadays it serves as an umbrella organization for several projects related to the Commons.

Defense Distributed is an online open-source hardware organization that develops digital schematics of firearms in CAD files, or "wiki weapons", that may be downloaded from the Internet and used in 3D printing or CNC milling applications. Among the organization's goals is to develop and freely publish firearms-related design schematics that can be downloaded and reproduced by anyone with a 3D printer or milling machine, facilitating the popular production of ghost guns.

Deterrence Dispensed is an online group that promotes and distributes open-source 3D printed firearms, gun parts, and handloaded cartridges. The group strongly supports freedom of speech applied to computer code and blueprints as well as the copyleft movement.

Drupal-club (Minsk) is an open-source community in Belarus which promotes free software principles in society. During the 2010-2013 years, this club was an organizer of various social activities such as the Drupal Rally, the Global Learning Drupal Days, and regular sessions. Drupal-club takes part in the implementation of some non-commercial projects and has formed a cooperative via the Drupal Association.

Electronic Information for Libraries (EIFL) works with libraries worldwide to enable access to digital information for people in developing and transition countries. They are an international not-for-profit organisation based in Vilnius with a global network of partners.

FenixEdu is a software project focused on developing open source software for schools. The core development team currently works out of Instituto Superior Técnico, Lisbon.

Free Software Foundation Tamil Nadu is a not-for-profit organisation formed in 2008 as a part of Free Software Movement of India (FSMI). This organisation is a social movement that works towards enlightening the masses with the essence of free software and to liberate knowledge. FSFTN organises different workshops and seminars in Tamil Nadu among the youth to spread the idea of knowledge liberation.

Free Software Movement of India (FSMI) is a national coalition of various regional and sectoral free software movements operating in different parts of India. The formation of FSMI was announced in the valedictory function of the National Free Software Conference - 2010 held in Bangalore during 20–21 March 2010. FSMI is a pan Indian level initiative to propagate the ideology of free software and to popularize the usage of the free software. One of the declared aims of the movement is to take Free Software and its ideological implications to computer users “across the digital divide”, to under-privileged sections of society.

Free Software Movement Karnataka (FSMK) is a non-profit organization working for spreading free software and its ideals. The movement is inspired by software freedom visionaries like Richard Stallman and Eben Moglen. FSMK is one of the member organizations of Free Software Movement of India.

The gpl-violations.org is a not-for-profit project founded and led by Harald Welte in 2004. It worked to make sure software licensed under the GNU General Public License was not used in ways prohibited by the license.

Hamakor, officially known as Hamakor – Israeli Society for Free and Open Source Software, is an Israeli non-profit organization dedicated to the advancement of free and open source software in Israel.

The HSA Foundation is a not-for-profit engineering organization of industry and academia that works on the development of the Heterogeneous System Architecture (HSA), a set of royalty-free computer hardware specifications, as well as open source software development tools needed to use HSA features in application software.

The Human Rights Data Analysis Group is a non-profit, non-partisan organization that applies rigorous science to the analysis of human rights violations around the world. The organization has published findings on conflicts in Syria, Colombia, Chad, Kosovo, Guatemala, Perú, East Timor, India, Liberia, Bangladesh, and Sierra Leone. The organization provided testimony in the war crimes trials of Slobodan Milošević and Milan Milutinović at the International Criminal Tribunal for the former Yugoslavia, and in Guatemala's Supreme Court in the trial of General José Efraín Ríos Montt, the de facto president of Guatemala in 1982-1983. Gen. Ríos was found guilty of genocide and crimes against humanity. Most recently, the organization has published on police violence in the United States.

International Centre for Free and Open Source Software (ICFOSS) is an autonomous organization set up by the Government of Kerala, India and having the combined mandate of popularizing Free and Open Source Software for universal use; consolidating the early FOSS work done in Kerala; and networking with different nations, communities and governments to collaboratively promote FOSS.

The International Open Source Network has as its slogan "software freedom for all". It is a Centre of Excellence for free software in the Asia-Pacific region.

Jasig is a non-profit US organization founded by a group of university IT personnel in late 1999 with the stated goal of creating open source computer programs for use in higher education environments, mostly written in the Java programming language. Jasig, “a federation of higher ed institutions interested in open source”, is registered as a US 501(c)3 non-profit organization. The name Jasig is an acronym for Java in Administration Special Interest Group. The founders of Jasig included Carl Jacobson from University of Delaware, David Koehler from Princeton, Bernie Gleason from Boston College, Ted Dodds at the University of British Columbia, Jeffrey Gozdieski and Art Pasquinelli from Sun Microsystems.

KDE is an international free software community that develops free and open-source software. As a central development hub, it provides tools and resources that allow collaborative work on this kind of software. Well-known products include the Plasma Desktop, Frameworks and a range of cross-platform applications like Krita or digiKam designed to run on Unix and Unix-like desktops, Microsoft Windows and Android.

A Linux User Group or Linux Users' Group (LUG) or GNU/Linux User Group (GLUG) is a private, generally non-profit or not-for-profit organization that provides support and/or education for Linux users, particularly for inexperienced users. The term commonly refers to local groups that meet in person, but is also used to refer to online support groups that may have members spread over a very wide area and that do not organize, or are not dependent on, physical meetings. Many LUGs encompass FreeBSD and other free-software / open source Unix-based operating systems.

The Metasploit Project is a computer security project that provides information about security vulnerabilities and aids in penetration testing and IDS signature development. It is owned by Boston, Massachusetts-based security company Rapid7.

The New Zealand Open Source Society is an incorporated society supporting the advocacy and promotion of open-source software in New Zealand.

Framasoft is a popular education social network created in November 2001 by Alexis Kauffmann, Paul Lunetta, and Georges Silva. Since 2014, it is supported by a nonprofit organization of the same name based in Lyon, France. Mainly focused on free software valorisation, it is divided into three main branches of activities based upon a collaborative model: promotion, dissemination and development of free software, and enrichment of the free culture movement and online services.

The Open Source Initiative (OSI) is a California public benefit corporation, with 501(c)3 tax-exempt status, founded in 1998. It promotes the usage of Open Source Software.

Open Whisper Systems was a software development group that was founded by Moxie Marlinspike in 2013. The group picked up the open source development of TextSecure and RedPhone, and was later responsible for starting the development of the Signal Protocol and the Signal messaging app. In 2018, Signal Messenger was incorporated as an LLC by Moxie Marlinspike and Brian Acton and then rolled under the independent 501c3 non-profit Signal Technology Foundation. Today, the Signal app is developed by Signal Messenger LLC, which is funded by the Signal Technology Foundation.

OpenForum Europe (OFE) is a European open source software and open standard not-for-profit organisation advocating for interoperability in technology. Its key objective is to contribute to achieve an open and competitive Digital ecosystem in Europe.

Project Jupyter is a project and community whose goal is to "develop open-source software, open-standards, and services for interactive computing across dozens of programming languages". It was spun off from IPython in 2014 by Fernando Pérez. Project Jupyter's name is a reference to the three core programming languages supported by Jupyter, which are Julia, Python and R, and also a homage to Galileo's notebooks recording the discovery of the moons of Jupiter. Project Jupyter has developed and supported the interactive computing products Jupyter Notebook, JupyterHub, and JupyterLab.

The Signal Foundation, officially the Signal Technology Foundation, is an American non-profit organization founded in 2018 by Moxie Marlinspike and Brian Acton. Its mission is "to develop open-source privacy technology that protects free expression and enables secure global communication."

The Society for Promotion of Alternative Computing and Employment (SPACE) is located in Trivandrum, Kerala, India.

Software Freedom Conservancy is an organization that provides a non-profit home and infrastructure support, including legal services, for free/open source software projects. The organization was established in 2006, with the help of the Software Freedom Law Center (SFLC). As of June 2018, the organization had over 40 member projects.

The Software Freedom Law Center (SFLC) is an organization that provides pro bono legal representation and related services to not-for-profit developers of free software/open source software. It was launched in February 2005 with Eben Moglen as chairman. Initial funding of US$4 million was pledged by Open Source Development Labs.

Software in the Public Interest, Inc. (SPI) is a US 501(c)(3) non-profit organization formed to help other organizations create and distribute free/open-source software and open-source hardware. Anyone is eligible to apply for membership, and contributing membership is available to those who participate in the free software community.

Swecha is a non-profit organization formerly called as Free Software Foundation Andhra Pradesh later changed name to Swecha which is also the first Telugu Operating System released in year 2005, Swecha is a part of Free Software Movement of India (FSMI). This organization is a social movement that works towards enlightening the masses with the essence of Free Software and to liberate knowledge to the commoners. Swecha organizes different workshops and seminars in the Indian state of Telangana and Andhra Pradesh among the youth to spread the idea of knowledge liberation. The swecha has a sizable number of followers in states of Telangana and Andhra Pradesh and a vibrant community of software users, students, academicians and software professionals/developers determined to provide quality software built on the guidelines of free software development model.

Tactical Tech is an international nongovernmental organization that engages with citizens and civil-society organisations to explore and mitigate the impacts of technology on society. Since 2012, the organisation has been based in Berlin.

XMPP Standards Foundation (XSF) is the foundation in charge of the standardization of the protocol extensions of XMPP, the open standard of instant messaging and presence of the IETF.