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Proteus is a first-person indie game in which the player explores randomly generated island landscapes set against soothing, reactive musical soundscapes.

Assetto Corsa is a racing game/simulation with a strong focus on realism.
It is developed by Kunos Simulazioni, a small indie developer based in Italy best known from two other racing sims: Ferrari Virtual Academy and NetKar Pro.

While the game is still in developement, a Technology Preview (v0.9.9) is available to all owners of NetKar Pro, containing one car - the Lotus Elise SC and one track - Autodromo dell'Umbria aka Magione. The full game will contain a large number of licensed cars and tracks, but a full content list has not yet been disclosed.

Quantum jump from planck to planck as you hit critical velocity in Boson X, a new rotational runner from Mu & Heyo. Build up speed inside a massive particle accelerator and generate high-energy collisions to discover strange new particles. Use precise timing and fast reflexes to navigate a subatomic world where floors and ceilings don't exist. Will you be fast enough to find the elusive Boson X?

Free to play. Visit developer website or Desura, or buy it on Steam for a few bucks.

Universe Sandbox is an interactive space gravity simulator. Using Universe Sandbox, one can see the effects of gravity on objects in the universe and run scale simulations of our Solar System, various galaxies or other simulations, while at the same time, interacting and maintaining control over gravity, time, and other objects in the universe (moons, planets, asteroids, comets, black holes, etc.) Currently this software is only available for Windows based PCs.

Be ready for loads of running, jumping, climbing and little to no weapon wielding. Make your way across the City's rooftops as a death- and gravity-defying Runner. Your agility and awareness of your environment will be your most useful resources as you try to stay alive and uncover the truth on a murder implicating your own cop sister.

Halo: Combat Evolved is a first person shooter developed by Bungie Studios and published by Microsoft Games. Released on November 15, 2001, it was a launch title for the Xbox and helped push the console ahead in the console war. It was ported to the PC and Mac in 2003 and has spawned several sequels. The player assumes the role of Master Chief, the rank of a cybernetically enhanced warrior who is fighting to save Earth from an alien race called "The Covenant." Deserted on a mysterious "Halo" ring world, he is left to discover its deadly secrets.