Open source Web forums

Discourse

Discourse is the 100% open source discussion platform built for the next decade of the Internet. Use it as a mailing list, discussion forum, long-form chat room, and more! (GPL)

Cross-platform

Flarum

Flarum is a delightfully simple discussion platform for your website. It's fast and easy to use, with all the features you need to run a successful community. (MIT)

Cross-platform

MyBB

MyBB is the free and open source, intuitive, extensible, and incredibly powerful forum software you've been looking for. Through plugins and themes, you can extend MyBB's functionality to build your community exactly as you'd like it. (GPL)

Cross-platform

NodeBB

NodeBB is next generation forum software. It's powerful, mobile-ready and easy to use. NodeBB is built using the Node.js server-side Javascript platform, delivering unmatched performance. Building on this high performance platform means fast and dependable performance that will support even the biggest and most active community. (GPL)

Cross-platform

phpBB

Millions of people use phpBB on a daily basis, making it the most widely used opensource bulletin board system in the world. (GPL)

Cross-platform

Talkyard

Talkyard is a discussion tool that people and organizations can use, to find ideas and solutions, about how to change & improve the world or their neighborhood. (MIT)

Cross-platform

Vanilla

Vanilla provides hosted and open source community forum software that powers discussion forums on thousands sites. Built for flexibility and integration, Vanilla is the best, most powerful community solution in the world. (GPL)

Cross-platform

YAF.NET

The YAF.NET (YetAnotherForum.NET) project is an international collaboration of like-minded, skilled, and creative individuals who are striving to make YAF.NET the most robust and malleable forum solutions available. (Apache)

Windows

8 applications