That said, if collab features are your top priority, then OnlyOffice may be the better option, since it was built web-first. I don't know what OpenOffice offers here though.
They haven't been making it super clear, but you can actually create, edit, and share text documents in Proton Drive right now! It's just not a separate thing like with Google.
"Sheets" refers to spreadsheets, not text documents.
Only in browser. It's not a properly functioning app.
I hope this leads to being able to have a Proton sheets or whatever name the Google sheets equivalent will be.
I'd recommend checking out OnlyOffice
LibreOffice can also be self-hosted as a web service.
Libreoffice does not have collab features which Open Office does
LibreOffice Online does. It's not built around it, but Collabora's work has added some level of collaboration to it.
That said, if collab features are your top priority, then OnlyOffice may be the better option, since it was built web-first. I don't know what OpenOffice offers here though.
They haven't been making it super clear, but you can actually create, edit, and share text documents in Proton Drive right now! It's just not a separate thing like with Google.
"Sheets" refers to spreadsheets, not text documents.
Only in browser. It's not a properly functioning app.