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  1. OSI is the authority that defines Open Source, recognized globally by individuals, companies, and by public institutions. Learn more about the Open Source AI Definition, the Cyber Resilience Act, and how to support the Open Source ecosystem.

    • About

      The Open Source Initiative (OSI) is a non-profit corporation...

    • Programs

      Home Programs. We define Open Source. For developers,...

    • Licenses

      Open source licenses are licenses that comply with the Open...

    • Open Source Definition

      1. Free Redistribution. The license shall not restrict any...

    • News

      As part of the Open Source AI Definition roadshow and as we...

    • Donate to OSI

      Support open source now! Thank you for supporting open...

    • Sponsors

      While the OSI is very grateful for their support, the OSI...

    • History

      OSI was formed in 1998 as an educational, advocacy, and...

  2. The Open Source Initiative (OSI) is the steward of the Open Source Definition, the most widely used standard for open-source software. Founded in 1998, the Open Source Initiative coined the term open source in opposition to the free software movement.