You might not have played Warsow (PC)

Warsow is an futuristic first person shooter. It is free to play and has an open source engine, which enables easy modding.

Gameplay: First Person Shooter, Arena, Fast Paced
Imagine UT with the spot on controls of Quake. Put a cell shading graphics onto it and you have yourself Warsow. It is an incredibly good free to play shooter, that works well in duels, team matches or in free for all. Everyones favourite manouvers like rocketjumps and walljumps are possible and controling the Weapon/Armor drops on the map is key to victory.

Get the game for free on the official website.