UFO:AI

UFO: Alien Invasion is a free, open-source game heavily inspired by the original UFO: Enemy Unknown or X-COM: UFO Defense in North America. It can be downloaded at the official website.

UFO: Alien Invasion
Overview General Information Versions Campaign Geoscape UFO Detection and Interception Nations PHALANX Bases Base Construction Production and UFO Disassembly Research Installations Craft Soldiers Soldier Development Soldier Equipment Aliens Alien Life Forms UFOs UFO Components Alien Bases	Ground Combat Ground Combat Missions Map Selection Mission Types Tactics Squad Composition Strength and Weight Management Wounds Initial Deployment Cover and Concealment Scouts Reaction Fire Indirect Fire Close Quarter Battle Auxiliary Equipment Smoke Grenade Flashbang Incendiary Grenade Medikit	Campaign Strategies Base Management Base Locations Base Layout Economics Buying/Selling/Transferring Employee Expenses UFO Recovery Disassembly Profit Common Mistakes