Space Station 13 is a paranoia-laden roleplaying game set against the backdrop of a nonsensical, metal death trap masquerading as a space station.
Read more here.
There is currently two BeeStation servers, hosted by Crossedfall.
Download BYOND to play.
BeeStation Golden (LRP): byond://golden.beestation13.com:7777
BeeStation Sage (MRP): byond://sage.beestation13.com:7878
Check out these maps that come packaged by default in the game.