0 A.D. (pronounced "zero ey-dee") is a cross-platform real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of ancient civilizations, each depicted at their peak of economic growth and military prowess.
Avoision is a very simple arcade-style game. There's no story, no fancy graphics, no campaigns--just frantic, high-speed gameplay. Gameplay consists of moving a green block around with the arrow keys. The goal is to capture the red block before the timer runs out to score points. You must avoid all the white blocks that appear as you progress through the game.
Bitfighter is a game that feels a little like Asteroids on steroids. It's a multiplayer space-based combat and strategy game, featuring customized ships, multiple game modes, cool retro graphics, and smooth network play. It also includes a full featured level editor, Lua scriptable bots, and other cool features. It has a very active development team, so the game keeps improving.
Frogatto is an old-school 2D platformer game starring a certain quixotic frog. It has gorgeous, high-end pixel art, pumping arcade tunes, and all the gameplay nuance of a classic console title. Run and jump over pits and enemies. Grab enemies with your tongue, swallow them, and then spit them out at other enemies as projectiles! Fight dangerous bosses, and solve vexing puzzles. Collect coins and use them to buy upgrades and new abilities in the store. Talk to characters in game, and work to unravel Big Bad Milgram's plot against the townsfolk! At over 30 levels set in 4 different environments, Frogatto is not a flash in the pan, and has the play-time you'd expect from a real video game.
Gigalomania is a 2D real time strategy game that is a clone of Mega-Lo-Mania. The gameplay consists of researching and developing new technology with which to conquer your enemies, from rocks and sticks to nuclear weapons and spaceships. You can advance through ten different ages, from the stone age to the future. There are 28 different maps to play through. The game is still under development, but is entirely playable in its current state.