From the publisher's website:
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!
More than 1,500,000 copies are in print - not counting foreign editions. GURPS Lite (4th Edition), a 32-page distillation of the basic GURPS rules, is available for free download. We also have dozens of GURPS adventures and e-books available on e23.
Whatever your favorite roleplaying genre might be, GURPS can handle it.