I was just over at LibreWolf looking for possibly something to patch the HTML hole. But first I went to my google apps and I gave youtube the finger. No more youtube on my phone. Fuck you google! I am Loops all the way (LOL I gotta watch some shit, not gonna go cold turkey!)
One of those has a network version of libre office so you can dockerize it and serve it from your central server.
You can run either one from a server or locally. LibreOffice allows realtime collaboration in spreadsheets only. OnlyOffice I think allows it in all programs. Both have web editors. Both work with Nextcloud /OwnCloud. It depends on what you want to do with your server.