Mattermost is a self-hosted alternative to Slack.
The SIPB Mattermost runs on an XVM with decent specs.
almonds:
I recommend using the Matrix or Zephyr, for a few reasons:
- the XVM instance runs an old distro;
- it keeps running out of space;
- it is a nontrivial pain to update the Mattermost, and it updates relatively frequently;
- Mattermost is undergoing enshittification (features being limited, behind "Enterprise" or "Teams" editions);
- it uses a MariaDB database, which Mattermost has been loosening support for;
- many other nontrivial details which I cannot remember at the moment.