Ascii Sector is a free space combat/exploration/trading game for Windows, Mac OS X and Linux. You start with a simple spaceship and can then accept missions or trade goods to earn enough money to upgrade your ship or buy a new one.
You can engage in deadly fights both in space, on the ground and on board spaceships, and using the Ascii Sector scripting language, you can create your own quests for the game or have fun with other players' quests.
If you're ready to step into the Ascii Sector universe, go ahead and download the free game. Or visit the discussion forums for tips and tricks and development updates from the game's single developer.