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InfluxDB
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In the sidebar for this sub under the 'other projects' section there is an entry for Cataclysm: Looming Darkness; a multiplayer rewrite of the game. As I haven't tested that fork myself I can't vouch for how complete/actively developed it is, it's probably your best bet for a multiplayer cata.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.