Flarum is free, open-source forum software with a focus on simplicity. You can use Flarum to easily set up a discussion forum for your website. Flarum is developed openly on GitHub.
It is the combined successor of esoTalk and FluxBB. It aims to be:
Beautiful and responsive. This is forum software for humans. Flarum is carefully designed to be consistent and intuitive across platforms, out-of-the-box. It’s backed by LESS, so themeing is a cinch.
Powerful and extensible. Customize, extend, and integrate Flarum to suit your community. Flarum’s architecture is amazingly flexible, prioritizing comprehensive APIs and great documentation.
Free and open. Flarum is released under the MIT license.