Pathfinder

Game Summary
The Pathfinder Roleplaying Game puts you in the role of a brave adventurer fighting to survive in a world beset by magic and evil!

Playing the Game
The Pathfinder Roleplaying Game is released under the Open Game License, meaning the core rules that drive the Pathfinder RPG system are available to anyone to use for free under the terms of the OGL. This compendium of rules, charts, and tables contains all of the open rules in the system, and is provided for the use of the community of gamers and publishers working with the system.

Additional Resources and References
http://paizo.com/pathfinderRPG/prd/ - The Pathfinder Roleplaying Game Reference Document website