1530
FLOSS communities right now
(i.imgflip.com)
4 pane comic of dolan on the left and spooderman on the right
pane 1 (dolan): cum join opensurce cummunity!
pane 2 (spooderman): shure! how joyn?
pane 3 (dolan): Here discord! (with discord logo)
pane 4 (spooderman with tears in eyes): y u do dis?
Anything else that can:
Discourse is a great choice - it meets both criteria. Even phpbb meets the requirements.
Even Zulip is objectively better than Discord. It meets point 1 very well. I don't know how well it does in point 2.