Get past the clunky interface, turn off the sound and ignore the crude graphics; AI War is a masterpiece of real-time strategy gaming.
First released for Windows in 2009, AI War was hailed as something of a revolution in terms of real-time strategy gaming. The game sees you commanding a space fleet across a galaxy, in an attempt to neutralise an overpowering artificial intelligence. As with other games in the genre, you'll manage and accumulate various resources, construct units en masse, and acquire upgrades and other technology. AI War has a twist though; the enemy AI will generally ignore you until you are perceived as a big enough threat, so you need to be careful to avoid attracting too much attention as you expand.