Cool! It doesn't seem to be opened to anyone for now?
Here's the repo: https://github.com/suitenumerique/docs

I'll be following this. Once the public can use it, I'll definitely replace google docs with it.

This work is released under the MIT License (see LICENSE).

While Docs is a public driven initiative our licence choice is an invitation for private sector actors to use, sell and contribute to the project.

I hope that really takes off.

There’s also write.ellipsus.com as a free google docs alternative (from Germany) and it’s currently in beta but open to the public :) I use it already and I like it a lot. They are also against generative AI which is very important to protect creative writing.