GURPS

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Generic Universal RolePlaying System!
With GURPS, you can be anyone you want – an elf hero fighting for the forces of good, a shadowy femme fatale on a deep-cover mission, a futuristic swashbuckler carving up foes with a force sword in his hand and a beautiful woman by his side. . . or literally anything else! GURPS has been the premiere universal roleplaying game for almost two decades. The new Fourth Edition makes it even better!

Basic Rules:

http://www.sjgames.com/gurps/lite/

The Sunken City RPG campaign will probably use GURPS. The GURPS lite gives you the possiblity to check out the rules and maybe even create your first character.