https://www.collaboraonline.com/
https://www.onlyoffice.com/
I'd love to like LibreOffice, but they need some Mac UI/UX people if they ever want mainstream Mac users.
2. The yellow help information appears directly behind cursor which makes it hard to see.
3. In print popup, "print current page" option is not available, we have to provide page numbers instead every time.
Just a few observations.
As a Linux user I (have to) use both Google Docs and LibreOffice.
Aside from collaborative editing, Google Docs is like an online version of Windows WordPad (not Notepad). It supports only a subset of MS Word but just enough for daily use. It refuses to open docs with advanced formatting -- my most recent example is a legal pleading.
LibreOffice supports more MS Word features, but is less polished and buggy. I occasionally find certain operations break the layout and a Ctrl-Z doesn't restore it.
I have some legal and administrative issues at the moment that require me to share office docs fairly regularly, as well as editing PDFs for filling in forms. I have had no collaboration problems at all with either of these activities exclusively using libreoffice. At one point I tried out the online versions (google docs / office 365 online) and it was a disaster.
sudo apt purge libreoffice*
sudo apt install libreoffice-gtk3