The Wayback Machine - https://web.archive.org/web/20130415194622/https://dev.twitter.com/opensource

Open Source

Introduction

Twitter is built on open source software, from the back-end to the front-end. Twitter engineers use, contribute to and release a lot of open source software. We of the Twitter Open Source Program Office support a variety of open source organizations and are grateful to the open source community for their contributions, and want to maintain our healthy, reciprocal relationship.

If you have questions or problems, please tweet us at @twitteross. For media inquiries, please go here.

Development

If you're interested in the projects we have released, check out our official organization on GitHub.

If you want to stay up to date, please follow our official twitter account.

Like what we do? Then consider finding a job you're passionate about and come @JoinTheFlock!

Code and Documentation Licensing

The majority of open source software exclusively developed by Twitter is licensed under the liberal terms of the Apache License, Version 2.0. The documentation is generally available under the Creative Commons Attribution 3.0 Unported License. In the end, you are free to use, modify and distribute any documentation, source code or examples within our open source projects as long as you adhere to the licensing conditions present within the projects.

Also note that our engineers like to hack on their own open source projects in their free time. For code provided by our engineers outside of our official repositories on GitHub, Twitter does not grant any type of license, whether express or implied, to such code.