Thredded
Open source, self-hosted forums
21 Alternatives To Thredded
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Flarum
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MyBB
MyBB is a discussion board software that runs on PHP and MySQL
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Simple Machines Forum
Simple Machines offers free open source software such as SMF, the powerful and easy to use community forum written in PHP. Start interesting discussions on your website!
Trello
Infinitely flexible. Incredibly easy to use. Great mobile apps. It’s free. Trello keeps track of everything, from the big picture to the minute details.
XenForo
Intuitive. Social. Engaging. Fast. XenForo brings a fresh outlook to forum software.
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miniBB
miniBB is a standalone, open source program for building your own Internet forum.