It's not LibreOffice, but while revisiting CryptPad (which I thought was a multiplayer notepad like etherpad or codimd, except with an encryption key in the url

It's not LibreOffice, but while revisiting CryptPad (which I thought was a multiplayer notepad like etherpad or codimd, except with an encryption key in the url fragment identifier) I was impressed to see that they're expanding to become an entire office suite. You get a WYSIWYG editor (I'd rather wish for markdown but ok), spreadsheet editor, survey forms, and more which I don't remember, all live like google docs but (as I understand it, I didn't audit it) end to end encrypted between the users. It's a bit heavy because everything has to happen on the client side, so it's a lot of JavaScript, but after the page loads it works smoothly. You can self host it as well, there's a list of instances somewhere on https://cryptpad.org https://cryptpad.org with the official instance being https://cryptpad.fr https://cryptpad.fr LibreOffice has a ton more features and is way harder to port. Case in point: I was at an open source conference where LibreOffice proudly demo'd their new server version. At some point they drop that it uses mapnik. Me, confused, asked huh why'd you use an OpenStreetMap rendering library? Turns out they basically run the ancient C++ UI on the server and make a VNC-like connection and that map tiles is the fastest way to load partial screen updates. At least, that's what I remember from that presentation, I haven't looked into that madness further, but that's LibreOffice online...