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Welcome to The Open Source Initiative

Open source software is software that can be freely used, changed, and shared (in modified or unmodified form) by anyone. Open source software is made by many people, and distributed under licenses that comply with the Open Source Definition.

The Open Source Initiative (OSI) is a global non-profit that supports and promotes the open source movement. Among other things, we maintain the Open Source Definition, and a list of licenses that comply with that definition. See our about and history pages for more.

Latest News

Open Source Electronic Health Record Alliance Joins Open Source Initiative

Association highlights growth of open source software across industries and sectors

The Open Source Electronic Heath Records Alliance, or OSEHRA, a non-profit community dedicated to supporting open source users, developers, service providers, and researchers engaged in advancing health information technology, has joined the Open Source Initiative's (OSI) Affiliate Membership program. OSI Affiliates are organizations committed to public support for open source software and the role the OSI plays therein. The current Affiliate membership is a who's-who of the world of open source software.

OSI releases 2014 Annual Report

Thank you to the open source software community for a great 2014!

Over the past year the Open Source Initiative, with the help of our active community of Individual and Affiliate Members as well as our generous Corporate Sponsors and Supporters, has re-invested in our infrastructure to increase interaction with the open source community, ensuring our continued role in promoting and protecting the integrity of open source.

TYPO3 Association Joins Open Source Initiative as Affiliate Member

Shared commitment to open source community-development, education and promotion of non-proprietary software.

The TYPO3 Association, a non-profit organization founded to ensure the sustained and long-term development of the various TYPO3 software projects--including the highly flexible, scaleable and customizable TYPO3 Web Content Management system--has joined the Open Source Initiative ® (OSI) as an Affiliate Member. TYPO3 supports an international community of users and developers through: internal and external communication, spreading knowledge and competence; organizing informational and training events, and; securing trademark rights in the interest of the TYPO3 community.

WordPress Foundation Becomes an Open Source Initiative® Affiliate Member

OSI to help share Wordpress' success as a model for other open source projects.

The Open Source Initiative the premiere organization that promotes and protects open source, announced today that the WordPress Foundation (WordPress) has joined the OSI as an Affiliate Member.

Engineering Group Becomes An Open Source Initiative Corporate Sponsor

Engineering Group confirms its support for global open source communities and contributes to OSI’s growth

Engineering Group, a founding member of the OW2 Consortium ( and an associate member of Eclipse Foundation (, announced today its corporate sponsorship of the Open Source Initiative ( Founded in 1998, the Open Source Initiative protects and promotes open source by providing a foundation for community success. It champions open source in society through education, infrastructure and collaboration. In 2011, the OSI created a process for wider participation initiating an affiliate program, launching an individual membership program and encouraging corporate sponsorship.

prPIG Joins the Open Source Initiative

Partnership will educate students regarding the power of open source software and spur technological and social innovation.

The Open Source Initiative, the premiere organization that promotes and protects open source, announced today that the Puerto Rico Python Interest Group (prPIG) has joined the OSI as an Affiliate Member. prPIG’s support of open source software development and its advocacy for the adherence to the open source definition are supporting software innovation in Puerto Rico.

OSI and Conservancy Announce US Tax Exemption Working Group

Software Freedom Conservancy and the Open Source Initiative are pleased to announce that they are the founding members of a working group focused on tax exemption issues for organizations in the United States.

Recent activity by the Internal Revenue Service in response to applications for tax exempt status have sparked a lot of interest and discussion amongst free and open source software communities.

Recent Activities

February 2, 2014: January '14 Newsletter The OSI published its latest newsletter with updates on Affiliate activities, member profiles and news and events. see it now...

April 27, 2013: OSI To Host DC Metro Open Source Community Summit - register now! Read more...

February 27, 2013: OSI Board Reaches out to Washington D.C. Organizations week of May 6, 2013 - register now!. Read more...

December 15, 2012: The Board are sad to hear of the sudden death of former OSI Board member Raj Mathur. Read more...

October 17, 2012: OSI and OSHWA Sign Agreement: OSI and the Open Source Hardware Association have signed an agreement clarifying their mutual trademark position. Read more...

March 30, 2012: OSI now has a Google+ page. If you use Google+, please add it to one of your circles to stay up-to-date with our news.

January 18, 2012: The Open Source Initiative Board joined many other civil society organisations as co-signatories of this open letter expressing concern about SOPA and PIPA. Read more...