Description:

UFO: ALIEN INVASION is a strategy game featuring tactical combat against
hostile alien forces which are about to infiltrate earth at this very
moment. You are in command of a small special unit which has been
founded to face the alien strike force. To be successful on the long
run, you will also have to have a research team study the aliens and
their technologies in order to learn as much as possible about their
technology, their goals and the aliens themselves. 'UFO: Alien Invasion'
is heavily inspired by the 'X-COM' series by Mythos and Microprose.

ps: you need to have the ufo-data package installed,
available from plf: http://plf.zarb.org