@robertwgehl Might not even need jitsu/matrix if Nextcloud Talk fits the bill, but that might be a matter of taste/preference. Collabora if you want in-browser office-y stuff. Not sure how much planning is involved, but the Deck app in Nextcloud might help.
Something like Gitea if versioning outside of Nextcloud is desirable.
I'm not sure what your group's writing workflow looks like (or whether you already have one to begin with). Can you elaborate?
@robertwgehl right, so Libreoffice for offline, Collabora for viewing (and if need be, editing, and if need be, editing with several people at the same time) those ODTs when they're stored in Nextcloud.
@doenietzomoeilijk Basically, I'm just planning on a sort of lab/sandbox to get away from proprietary software or the surveillance companies. So, something flexible, something that someone used to Word or Google Docs can learn quickly.
@doenietzomoeilijk I have my own workflow, but I find that group work varies based on each person. I personally don't like using Google Docs-style browser writing, but I will do it if my collaborator wants to. I would prefer sharing versions of Libreoffice ODTs.