Comment by zevon

Maybe of interest to some people given the discussions in this thread: https://sciebo.de is an example of a successful "let's roll our own collaboration infrastructure" project at scale (aimed at about half a million users) based on Nextcloud with Collabora Office (= live document collaboration) and more integrated applications (calendars, contacts, tasks, forms, those kinds of things).

All hosted and maintained at German universities, with federation between them, with support for guest users and whatnot.

Quite nice and back when it started, it was very important for us because it enabled us to get a huge chunk of sensitive data back from Dropbox, Google Drive and the other cloud providers.

There's not too much English documentation around but https://wwuit-sys.zivgitlabpages.uni-muenster.de/sciebo/docs... is good.