OSI Affiliate Membership is an excellent opportunity for nonprofit organizations, open source projects & communities, educational institutions (K12 & Higher Ed.), and user groups to more deeply engage in and with the open source community. Affiliate membership is an ideal way for open source projects, and the communities that support them, to promote and extend the OSI mission, and contribute to the continued awareness and adoption of Open Source Software. If your organization believes in Open Source Software and your community wants to support our work, like all of the dedicated organizations listed below, please become a member today.
ADMB Foundation supports the AD Model Builder Community. The ADMB project supports the application of automatic differentiation (AD) for solutions to non-linear statistical modeling and optimization problems.
Apereo Foundation helps to support software used in thousands of educational institutions worldwide: the place higher education software projects, new or ongoing, can find help, support and sustenance.
The College of Management and information Technology at The American International University West Africa is a unique place of learning combining academic knowledge with professional development.
Association Francophone des Utilisateurs de Logiciels Libres promotes Libre software and open standards. AFUL gathers users, professionals, companies and other associations across French-speaking countries and regions.
Associazione LibreItalia promotes LibreOffice, a free office productivity tool, across all areas, from schools to civil society, from public administration to companies, with a focus on standard and open document formats.
BigBlueButton Foundation is a membership organization holding the license for BigBlueButton source code, the “BigBlueButton” trademark, and represents its membership as it carries out its mission.
Brandeis University, a medium-sized private research university with global reach, is dedicated to first-rate education while making groundbreaking discoveries.
Breathing Games develops free/libre and open source games, devices, and distributed databases to promote respiratory health and prevent asthma, cystic fibrosis, and other chronic respiratory diseases.
CENATIC supports Public Administrations through the General Secretariat of Digital Administration of the Ministry of Finance and Public Function to facilitate the creation of new reusable solutions.
California Association of Voting Officials promotes open source voting systems in public elections, and provides training, education, and management practices to election officials for the effective use of technologies.
Creative Commons helps share knowledge and creativity to build a more equitable, accessible, and innovative world, unlocking the full potential of the internet to drive a new era of development, growth and productivity.
Darbar Group Of Institutes and Dwarkadas Vitthaldas Darbar Memorial Trust, supports world class education, creating abundant opportunities in the areas of Management and Education.
Debian Project is an association of individuals who have made common cause to create a free operating system. This operating system that we have created is called Debian.
DemocracyLab empowers communities of people and projects that use technology to advance the public good.
Document Foundation is the home of LibreOffice and The Document Liberation Project providing powerful tools for the conversion of proprietary file formats to ODF.
The .NET Foundation was established to support an innovative, commercially friendly, open-source ecosystem around the .NET platform.
Drupal Association is dedicated to fostering and supporting the Drupal software project, the community and its growth through funding, infrastructure, education, promotion, distribution and online collaboration.
Eclipse Foundation provides a global community of individuals and organizations with a mature, scalable, and business-friendly environment for open source software collaboration and innovation.
FOSSASIA develops Open Source Software and Open Hardware through global partnerships, increasing access to open technologies, science applications, and knowledge that improve people's lives.
FreeBSD Foundation supports and promotes FreeBSD and community worldwide, funding and managing projects, sponsoring FreeBSD events, Developer Summits and providing travel grants to FreeBSD developers.
Friends of OpenDocument supports those promoting, improving, and providing assistance for the OASIS Open Document Format and open source software designed to operate on data in this format.
FUSS is a complete GNU/Linux solution for managing educational networks. FUSS is also a digital sustainability project allowing students and teachers to use the same IT tools available at school, at home.
GNOME Foundation furthers the goals of the GNOME Project, helping it to create a free software computing platform for the general public that is designed to be elegant, efficient, and easy to use.
Indiana University's mission is to to create, disseminate, preserve, and apply knowledge. University Information Technology Services tends to the modern, multifaceted technology environment at IU.
Internet Systems Consortium develops and distributes Internet networking software (BIND 9, ISC DHCP, and Kea DHCP), offering services in support of Internet infrastructure.
Open Source Matters serves the financial and legal interests of the Joomla project, a multilingual, flexible and free platform for digital publishing and collaboration, made and sustained by volunteers.
Journal of Open Source Software is an academic journal with a formal peer review process that is designed to improve the quality of the software submitted.
Kaiyuanshe is an alliance organized in China―common governance, consensus, and contribution―to promote and support open source among companies, communities and individuals.
KDE e.V. aids in creating and distributing free desktop software by securing funds, hardware, and other donations to aid KDE development and promotion.
Linux Australia represents approximately 5000 Australian users and developers of Free Software and Open Technologies, and facilitates internationally-renowned events including linux.conf.au.
Linuxfest Northwest, co-produced by Bellingham LUG and Bellingham Technical College, hosts topics on open source software and Linux; something for everyone from novice to professional!
Linux Foundation is dedicated to building sustainable ecosystems around open source projects to accelerate technology development and industry adoption.
Linux Fund is a community-neutral nonprofit organization that provides financial and administrative support to the open source community.
Linux Professional Institute enables economic and creative opportunities for everybody by making open source knowledge and skills certification universally accessible.
MariaDB Foundation supports continuity and open collaboration in the MariaDB ecosystem, guaranteeing a global contact point.
Marist College, a comprehensive, independent institution grounded in the liberal arts, educates over 7,000 students in 50+ programs, including fully online MBA, MPA, MS, and MA degrees.
Mautic Association, supporting the world's largest open source marketing automation project.
Mifos is an open platform for financial inclusion used worldwide, supported by local partners, and maintained and extended by an international team of volunteers.
Mozilla Foundation, guided by the Mozilla Manifesto, believes the Internet is a global public resource that must remain open and accessible to all.
Network Time Foundation develops, produces and maintains the most widely-used open source precision time software. Secure and reliable timekeeping is essential to record keeping in all industries.
New Zealand Open Source Society educates, advocates, and advances the use of Free and Open Source Software in Government, Business and Society in New Zealand.
Odoo Community Association or OCA, is a nonprofit organization whose mission is to promote the widespread use of Odoo and to support the collaborative development of Odoo features.
OASIS provides foundation services for open source projects with a path to standardization and recognition in global policy and procurement. We help open source communities with governance, fiscal agency services, developer support, licensing, and outreach.
Open Culture Foundation supports Taiwanese communities advocating for the use of open technologies in broader sectors (government, enterprises, and NGOs), including Open Source Software, open hardware, and open data.
Open edX is the massively scalable learning software platform behind edX, the online learning destination founded by Harvard and MIT in 2012.
Open Forum Europe works to promote the merits of openness in computing to politicians and legislators across Europe to facilitate open, competitive choice for IT users. Open Source, Standards, Procurement, Cloud and Internet are among our main focus areas.
Open Information Security Foundation was created to build community and to support open source security technologies like Suricata, the world-class IDS/IPS network monitoring engine.
Open Preservation Foundation's vision is open sustainable digital preservation. Founded in 2010 to steward the results of EU-funded R&D, OPF enables the development of best practice through interest groups, community events, webinars and training.
Open Research Institute, a research and development organization, provides all its work to the general public under the principles of Open Source and Open Access to Research.
Open Source Design is a community of designers and developers pushing more open design processes and improving the user experience and interface design of open source software.
Open Source Electronic Health Record Alliance is an open source community of users, developers, service providers, and researchers advancing electronic health record software and health information technology.
Open Source Community Africa works to increase contributions by African developers, designers, writers—everyone involved in technology—to open source projects locally and globally: creating the next billion creators.
Open Source Hong Kong fosters open source communities of developers, contributors, engineers, promoters, and users to encourage collaboration in the global open source community.
Open Source Software Institute experienced technical, military, and government people working together to make OSS-based solutions more accessible.
Open Source Sweden promotes a well-functioning national and international market for the development, sale, delivery and support of open software and services.
OpenMRS improves health care delivery in resource-constrained environments by coordinating a global community to create and support this software.
OpenProject Foundation creates a place for open source software, driven and inspired by the users, the community and by the utilization of state of the art technology.
Open Infrastrastructure Foundation (formerly OpenStack Foundation) helps people build and operate open infrastructure: code first projects that operate under the guiding principles of the “Four Opens”.
OpenStreetMap Foundation supports the OpenStreetMap Project, dedicated to encouraging the growth, development and distribution of free geospatial data and to providing geospatial data for anyone to use and share.
OpenUK is the UK organisation coordinating the UK’s leadership in Open Technology, being the 3 Opens: open source software, open source hardware and open data, across the UK.
OW2 is a global open source software community, working to promote the development of middleware, generic business applications, cloud computing platforms and foster a vibrant community and business ecosystem.
Plone Foundation exists to protect and promote Plone, supporting development and marketing, ensuring Plone remains the premier open source content management system.
Powering Potential uses technology to enhance education and stimulate imaginations of students in underdeveloped countries while respecting and incorporating values of the local culture.
Python Software Foundation promotes, protects, and advances the Python programming language, and to support and facilitate the growth of a diverse and international community of Python programmers.
Rensselaer Center for Open Source cultivates an inclusive, creative, and entrepreneurial community that seeks to empower students to develop open source solutions to real-world problems.
Sahana Software Foundation is dedicated to the mission of saving lives by providing open source information management solutions that enable organizations and communities to better prepare for and respond to disasters.
Snowdrift.coop improves the ability of ordinary people to fund public goods – things like software, music, journalism, and research – that everyone can use and share without limitations.
Software Freedom Conservancy helps promote, improve, develop, and defend Free, Libre, and Open Source Software (FLOSS) projects. Conservancy provides a non-profit home and infrastructure for FLOSS projects.
Software Liberty Association of Taiwan serves the free software and open source communities of Taiwan in order to foster community growth and promote the adoption of free and open source software applications.
SOUJava is a user group, made up of developers and evangelists of Java technology in Brazil, and aims to strengthen, expand and professionalize the use of Java in the country.
Sourcefabric, headquartered in Prague, Czech Republic, brings together minds from all corners of the globe to promote media development through the creation of open source software.
sysarmy (SysAdmin Argentinian Community) is the Systems Community that brings together all IT professionals for knowledge exchange and fun (not necessarily in that order)
The Perl Foundation is dedicated to the advancement of the Perl programming language through open discussions, collaboration, design, and code.
Tiki Software Community Association fosters the development of free and open source software, and promotes the free use by all who can benefit.
TODO Group is an open group of companies who want to collaborate on practices, tools, and other ways to run successful and effective open source projects and programs.
The TeX Users Group (TUG) is a membership-based not-for-profit organization, founded in 1980, for anyone who uses the TeX typesetting system created by Donald Knuth and/or is interested in typography and font design.
TYPO3 Association supports the development of TYPO3 CMS and takes part in shaping the future of the CMS.
University of Southern Queensland is a recognized leader in online and blended education, renowned for a supportive environment and student-focused commitment to learning and teaching.
Wikimedia Foundation is the nonprofit that hosts Wikipedia and other free knowledge projects by supporting communities of volunteers around the world who edit, improve, and add knowledge across Wikimedia projects.
Wikiotics Foundation is dedicated to making an interactive language instruction system that is freely licensed and freely available to anyone online.
WordPress Foundation is a charitable organization founded by Matt Mullenweg to further the mission of the WordPress open source project: to democratize publishing through Open Source, GPL software.
Xerte Project provides a full suite of open source tools for elearning developers and content authors producing interactive learning materials.
Historical list of all Affiliate Members (current and past), including the date each joined the OSI, is available.