Flarum
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Flarum is open source forum software used to run IndieWebForum.
Brainstorming
IndieAuth Plugin
Anthony Ciccarello and
gRegor Morrill would like to see a plugin that allows IndieAuth logins to a Flarum server[1][2][3]. The OAuth plugin seems like a good place to start.
Webmention Post and Reply Support
Anthony Ciccarello would like to be able to post and reply to posts on the forum using webmentions.