A simple turn-based artillery game and also a real-time strategy game in which players can counter each others' weapons with other creative accessories, shields and tactics. Test your skill in timing, aiming and judgement of distance, move around on the landscape, or outsmart your opponent...

Tilt the floor to roll a ball through an obstacle course before time runs out.

FlightGear is a flight-simulator created by an international group of volunteers, and released as free, open-source GPL software. It has been used for academic research, education, and for fun.

Frets on Fire is a game of musical skill and fast fingers. The aim of the game is to play guitar with the keyboard as accurately as possible.

It's an old school arcade game slung into the 21st century. Highlights include a customizable playing arena, HUD, unique graphics, and AI bots

Do you like old school deathmatch with modern features? How about rich, colorful, arcadelike atmospheres? How about...retro Sci Fi? Then you're going to love what Alien Arena has in store for you!

Flare (Free/Libre Action Roleplaying Engine) is a simple single-player Action RPG engine. Instead of being a general engine that handles many game types, this focused engine is small and easy to mod.

All movement in Celestia is seamless; the exponential zoom feature lets you explore space across a huge range of scales, from galaxy clusters down to spacecraft only a few meters across. A 'point-and-goto' interface makes it simple to navigate through the universe to the object you want to visit.

VDrift is a cross-platform, open source driving simulation made with drift racing in mind.

Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS. These structures provide many functions, the most important being...

MegaGlest is an entertaining free (freeware and free software) and open source cross-platform 3D real-time strategy game, where you control the armies of one of seven different factions: Tech, Magic, Egypt, Indians, Norsemen, Persian or Romans.

Players build an underground dungeon which is inhabited by creatures. Players fight each other for control of the underground by indirectly commanding their creatures, directly casting spells in combat, and luring enemies into sinister traps.

The game features 116 tracks in 16 sceneries, 14 cars and a Track Editor. It focuses on closed rally tracks with possible stunt elements (jumps, loops, pipes).

0 A.D is a free, open-source, historical Real Time Strategy (RTS) game currently under development by Wildfire Games, a global group of volunteer game developers for Windows. As the leader of an ancient civilization, you must gather the resources you need to raise a military force and dominate...

Astro Menace is a brilliant 3d scroll-shooter allowing you to feel the adrenalin rush of a fierce space battle against relentless swarms of alien invaders.

Gang Garrison 2 is a free multiplayer 'demake' of Valve's Team Fortress 2!