yes

Yeah nextcloud is a bit of a beast to manage alone. Tell you what, I’ll try selfhosting LaSuite sometime and I’ll tell you if it has it or not.

tbh I really don’t know for this solution, but you might like nextcloud, it’s exactly what you’re looking for, each part of the site is connected in that way.

They’re all cloud tools, but if you have a spare computer and some knowledge you can host it yourself.

To have a single user with multiple services you usually use a separate oauth provider, in the french government’s case that’s France connect but authelia is a good self-hosted option.

It’s possible these ones have a built-in system for this though, I haven’t checked.

This is only a part of france’s “LaSuite” (very original name guys), that seemingly will replace every equivalent american service.

https://lasuite.numerique.gouv.fr/

They generally work pretty well (demo on the site) and are a mix of homegrown solutions and rebrands of existing projects like matrix. All of them are open source.