The best Forum Software alternative to Discourse is Flarum, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Discourse and many of them are Forum Software so hopefully you can find a suitable replacement. Other interesting Forum Software alternatives to Discourse are phpBB, NodeBB, Vanilla Forum and XenForo.
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.
A compelling community experience. Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
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.
Invision Community is a flexible, feature-packed and easy to customize platform that powers some of the biggest and best communities on the web.
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.
MyBB is the free and open source, intuitive, extensible, and incredibly powerful forum software you've been looking for.
vBulletin (abbreviated as vB) is a commercial Internet forum software written in PHP using a MySQL database server.
WoltLab Suite (formerly Burning Board) is an enterprise grade CMS built for communities and forums.
Tribe is a white-label platform, empowering the new generation of online communities. It boosts users engagement and growth through widgets and integrations to existing stacks.
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Its fast lite-weight and easy, works with php and mariadb/mysql