Mojo Rules! used to simply be known as Suzerain or Suzerain Rules but when the Suzerain setting went multi system it became important to be able to tell the difference between the rules and the setting. The name Mojo Rules! was born.
Mojo Rules!:
Is available free as a PDF, check out the links for the various places it is available
Is a generic point based system
Uses a regular deck of playing cards (minus some of the face cards) for resolution
Has two combat systems - a simple turn based systems and a more advanced "real time" system
Defines characters in terms of Attributes and Feats
Includes mechanics for social and mental "combat" and "injury" - not just physical
Is slightly cinematic, characters can pull off some impressive stunts but fights are dangerous
Mid to high on details of the rules - more fine grain than Savage Worlds, less fine grain than Hero System or Gurps