The best open source alternative to MyBB is Discourse. It's not free, so if you're looking for a free alternative, you could try Discourse or Flarum. If that doesn't suit you, our users have ranked more than 25 alternatives to MyBB and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to MyBB are NodeBB, Vanilla Forum, Simple Machines Forum and bbPress.
Discourse is an open source discussion platform built for the next decade of the Internet. A modern forum, everything's been redesigned to be easy.
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.
Since its creation in 2000, phpBB™ has become the most widely used Open Source forum solution. Like its predecessors, phpBB™ 3.2 “Rhea” has an easy to use administration panel and a user friendly installation process, which allows you to have a forum set up in minutes.
A community forum allows you to engage and retain customers, keeping them interested and up-to-date with your latest product or service.
Vanilla provides a standards-compliant, multi-lingual, theme-able and pluggablecommunity forum software that powers discussion forums on 800,000 sites.
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes.
bbPress is forum software with a twist from the creators of WordPress. Its focused on web standards, ease of use, ease of integration, and speed. bbPress will try to keep things as small and light as possible while still allowing great add-on feature possibilities.
FUDforum (Fast Uncompromising Discussion Forum) is a free and open source web discussion forum. FUDforum combines an extensive feature set while maintaining the ability to generate forum web pages extremely fast.
ElkArte is a modern, powerful community building forum software. It is completely free to use and is licensed with an open source BSD-3 clause license.
FluxBB is a fast, light, user-friendly forum application for your website. FluxBB was designed as a lighter, faster alternative to some of the traditional feature heavy forum applications. It is easy to use and has a proven track record of stability and security making it an...
Feature-rich and lightning fast forums. Works standalone or as a Rails engine. Markdown by default, with plugins for code highlighting, KaTeX math, and BBCode. No JavaScript required. Easy deployment on Heroku or with Ansible.
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Still early development, limited features by comparison and forum structure/layout are quite different from traditional. Good features by default, but not the same methodologies for those comfortable with traditional discussion boards.