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
I’ve also been looking at this as an alternative! I need to make a proposal for my boss with our objectives and how the different options compare.