What it takes to self-host Fluxer
Fluxer self-hosts on one 4 GB Linux machine with rexctl. What fails most often: ports open in two firewalls, and a TURN server that rexctl does not install.
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Self-hosted Slack alternatives compared
Mattermost, Rocket.Chat, Synapse and Zulip compared on RAM, database, mobile push, SSO, upgrades and licence, using each vendor's own sizing figures.