Here is a list of some of the best free first person shooters available to download

Savage expertly redefines the first-person shooter and real-time strategy genres by combining elements of both into one cohesive experience.

F.E.A.R. Combat is the complete multiplayer component of F.E.A.R. and includes all the updates, additional official maps and additional official game modes all in one downloadable file. F.E.A.R. Combat users will be able to play against the owners of the retail
 

 War Rock is populated by thousands of players at any given time in servers all over the world. With a wide variety of customizable weaponry and vehicles, intuitive controls, and multiple battle modes, War Rock is a blast for seasoned FPS veterans and first-timers alike.

Originally designed as an expansion pack for Return to Castle Wolfenstein, Enemy Territory is one of the highest quality multiplayer freeware games available. There are serveral classes to choose from including covert ops, medic, soldier and field ops. There are always servers up to play on. Dont miss out! 

Rakion is an action game including unique battle forms such as the growth of the character, creature system and chaos mode. There are melee and ranged classes to play with.