I just prefer the looks of OnlyOffice, but I have heard people having localization problems with it. For my tiny use cases it has worked good so far.

What is LTT?

I’m not ignoring!

No, they can not. This is just a standard PR response.

Sci Hub is not down or did I miss something?

My bad, thought you meant support as incompatibilities. Offical support doesn’t matter much to you since you are not using an enterprise license.

Wdym nginx is not supported? It very much is. Nextcloud is a pain to set up but after fiddling with settings for a day or two you can get it working smoothly. In my experience there are no good alternatives to it.