The open source Microsoft 365 alternative openDesk, which is supported by the German government, plans to launch its version 1.0 in mid-October. The different components of the office and collaboration suite are established open source software from Collabora, Element, Nextcloud, Nordeck, Open-Xchange, Univention, OpenProject and XWiki.

Are you part of the project?

Does this include free hosting? I think Google Drive + Google Docs is the killer app. (And that extends to whatever it name of the Microsoft version.)