It is open source and supported by Nextcloud, IONOS, Proton, Tuta and more.[1]
I haven't tried it out, bu you can find the documentation on how to host it yourself here: https://euro-office.github.io/documentation/
A more mature alternative would is Nextcloud as it offers a lot more, but setup is reportedly more involved. It does appear to be available for enterprise customers as hosted version as well though: https://nextcloud.com/office/
The person making project X days are over. The energy and drive is extinguished from humanity. Ambition is all that’s left.
[1] https://techcrunch.com/2026/01/18/threads-edges-out-x-in-dai... [2] https://techcrunch.com/2026/05/22/meta-quietly-launches-a-ne...