http://www.spacestation13.com/
A game I played during my years of wow absence, that I still play a round of every now and again. There are some pretty decent RP communities on some servers.
You play as an employee on a Nanotrasen Space Station, in place to harvest and research a relatively new power source (Plasma/Phoron). The mechanics are incredibly in-depth, and it has a job system that lets you be Captain McDonk, the upstanding beacon of stability and order- or Donkus Stabbysmash, the renegade phoron miner ready to kill, steal, and generally FSU.
Check it out!
Space Station 13
Moderator: Officers