Growing the impact of Open Source around the world
The Open Source Initiative is the authority that defines Open Source, recognized globally by individuals, companies, and by public institutions.
October 1 – 3, 2025
A 3-day Virtual Event on Data Governance, and Open Source AI
OUR 2025 roadmap to a stronger ecosystem
Strengthening collaborations with legal experts, policymakers, and maintainers, as well as addressing the complexities of the Open Source Definition in the age of AI.
THE open source ai definition 1.0
We have released the first stable version of the Definition.
About the Open Source Initiative
The OSI is the authority that defines Open Source, recognized globally by individuals, companies, and by public institutions.
The leading voice on the policies and principles of open source
Protecting the Open Source ecosystem
We support institutions and individuals working together to create communities of practice in which the healthy open source ecosystem thrives.
From the blog
Support Open Source
As a public charity organization, OSI is supported by donations of corporations and individuals. Thanks to our sponsors that support our vision to be the leading voice on policies and principles of Open Source.
Upcoming Open Source Events
June 2026
UN Open Source Week 2026
July 2026
Open Source Innovation Days 2026
OpenSource.net is a resource for the community
The news site a not-for-profit platform for sharing knowledge, perspectives and advocacy to support a healthy open ecosystem.