Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.

MySims Kingdom - MySims Kingdom is based upon The Sims series but provides special and extremely different gameplay to the original series making it definitely worth your consideration.

Quake - Quake is a series of first-person shooter video games released by id Software.

Wandering Willows - Wandering Willows provides a universe full of missions and wildlife where gamers will attract pets, teach them, and more.

Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.

YoWorld (Yoville) - YoWorld or formerly known as Yoville, is an Action, Browser-based, MMO, RPG, Single-player and Multiplayer, Social networking, and Virtual World Simulation developed by Big Viking Games.