To me, I
Matrix for synchronous chat Threadiverse/Fediverse community for announcements and discussion Discourse for forums (smaller possible channels) OpenSource based Software forges like Forgejo (codeberg.org) or gitlab (gitlab.com) for issue tracking, code repo, Dev artfacts, and CI/CD.
The exciting things for these lay in the future though: ForgeFed to federate between forges like codeberg, gitlab, and independent instances of those software, plus federate to whole fediveriverse!
With the fediverse plugin for discourse
the commune app's to take matrix chats and growing them into full posts on fediverse is super exciting to me too
All of these helping to meet people where they are at in Free internet instead of the techno feudal states. There should be work to bridge to those people too, but I hope we can the Free internet better more.