UFO: Alien Invasion is a strategy video game in which the player fights aliens that are trying to take control of the Earth. The game is heavily influenced by the X-COM series (mostly by UFO: Enemy Unknown).
It is based on a modified id Tech 2 engine, and runs on Linux, Microsoft Windows, AmigaOS 4, and Mac OS X for both PPC and Intel Macs. There is also a version for Android, published on Android Market.
Currently, version 2.4 is the most up to date stable version (released April 22, 2012). Licensed under the GNU General Public License, UFO: Alien Invasion's engine is free software and its artwork is distributed under various open source licenses. Development is coordinated through SourceForge.net.
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