Is this kind of a nextcloud / office365 replacement?
It is an open alternative to MS365 developed on behalf of the German ministry of the interior and distributed as open source software.
https://www.opendesk.eu/en/product
If I remember correctly it is not an independent development but it is based on existing software and integrating them to build a consistent service.
I think it combines Nextcloud, Element, Jitsi and some other projects.
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