NodeBB

Category: Forums & Communities.

GPL-3.0🖥️ Self-hostable

Lemmy

Category: Forums & Communities.

AGPL-3.0🖥️ Self-hostable

Flarum

Category: Forums & Communities.

MIT🖥️ Self-hostable

Discourse

Category: Forums & Communities.

GPL-2.0🖥️ Self-hostable