La Suite numérique is a open source WIP office suite developped by french and german governments to replace proprietary office suite. Theyre self-hosteable but i found the official install instructions unclear to follow, and they have only instructions to install one app at a time. So i’ve used helmfile and did a one-command install myself.
Have fun
not true, the only one that’s just a rebranded pre-existing app is tchap, and most of them are made from scratch