Geo Society - Geo Society by Ben Hill is a great 2D Adventure-based Puzzle and RPG video game that offers beautiful old school visuals and allows you to enjoy a totally different type of Monster Hunting and Capturing video game experience.
Call of Duty - Call of Duty is a first-person and third-person shooter series by Infinity Ward.
Zenforms: Protectors - Zenforms: Protectors takes you to a whole new world of challenging Puzzles, amazing Adventures and RPG elements and allows you to immerse yourself into a very immersive and quite engaging game-play ever.
Quake - Quake is a series of first-person shooter video games released by id Software.
Mighty Monsters - Mighty Monsters offers a fantastic combination of Adventure-based Puzzles and RPG elements and takes you to a wonderfully colorful world filled with a number of different monsters and creatures.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.