Open Source Self-Hosted Software filtered by 'Forums and Lightweight'

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.

MyBB is the free and open source, intuitive, extensible, and incredibly powerful forum software you've been looking for.

Scoold is inspired by StackOverflow and implements most of its features. You can ask and answer questions, upvote and downvote posts, earn badges and reputation. Each edit creates an new revision, making it easy to follow the history of edits. Scoold is optimized for the cloud.

A Simple, Lightweight, Modern and fast Flat-File Forum, using Json and Markdown or BBcode.

PunBB is a fast and lightweight PHP-powered discussion board. It is released under the GNU General Public License.

YaBB is a free Perl forum (bulletin board) system that has rivaled professional message boards for years. YaBB provides chat for visitors where they can post any time and reply to anyone!.