Matrix collaboration that several European governments already run on their own infrastructure.
Alternatives
Alternatives to Slack
4 tools4 tools in this directory are filed as a practical replacement for Slack. Every entry names what it costs where that has been checked, and the country its operator is based in.
Work out what your team would pay →
Calls and chat inside your own Nextcloud, with no third-party signalling server in the path.
Stackfield
GermanyMunich work platform where the tasks and the messages are both end-to-end encrypted.
Berlin-built encrypted messaging and conferencing on the MLS standard, deployed in regulated settings.
Replacing more than Slack?
The same tools also replace these.