List of free forum stuff for developerππ½
If you're looking for all programming tools around forum (not just free). Check this page List of forum Programming Tools
GitHub Discussions
GitHub Discussions is a collaborative communication forum for the community around an open source project. Community members can ask and answer questions, share updates, have open-ended conversations, and follow along on decisions affecting the community's way of working.
Tag: discussion, forum

Forem
Forem is open source software for building communities. Empowering community by fostering thoughtful connection.
Tag: community, forum