MAY IS MAINTAINER MONTH
A month for Open Source maintainers to
gather, share, and be celebrated.
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
New project highlights Open Source Initiative and Apereo Foundation’s response to White House on AI
The Institute for Progress (IFP), a non-partisan U.S. think tank focused on innovation policy, announced a new project that highlights responses to the Trump Administration’s request for public comment on what should be included in a …
May is Maintainer Month: Celebrating those who secure Open Source
Maintainer Month returns this May, and the Open Source Initiative (OSI) is proud to join GitHub and a global community of contributors in honoring the individuals who steward and sustain Open Source projects. In 2025, Maintainer …
Advance your career and organization with the CODE certification
We're excited to highlight the Certified Open Source Developer for Enterprise (CODE) certification, led by the TODO Group and Linux Foundation Training & Certification, with the Open Source Initiative (OSI) contributing as a supporting partner.
Join us at the OFA Symposium 2025: Advancing open technology impact in uncertain times
The OSI is joining forces with fellow content partners Open Knowledge Foundation (OKF) and the Digital Public Goods Alliance (DPGA) to support OpenForum Academy (OFA) Symposium 2025, taking place November 18–19 at the FGV Law School …
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
May 2025
Open Source Founders Summit
The conference about building financially successful and sustainable open source companies.
OSI Maintainer Month
As part of our programming for May, OSI will host a virtual Town Hall with our affiliate organizations and invite the broader Open Source community to join. The Town Hall will be hosted May 21st at 11:30am Eastern Time and will offer a space to discuss how we can support maintainers, foster secure development practices, and share resources across geographies and sectors.
June 2025
UN Open Source Week 2025
https://www.un.org/digital-emerging-technologies/content/open-source-week-2025 UN Open Source Week 2025 facilitates global dialogue and collaboration on open source, digital public infrastructure (DPI), and the development of innovative solutions to [...]
Open Source Summit NA
Open Source Summit is the premier event for open source developers, technologists, and community leaders to collaborate, share information, solve problems, and gain knowledge, furthering [...]
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.