Re:X-Com! (Score 2, Informative)

CENEGA published two XCom inspired games in the past 5 years; UFO: Aftermath and UFO: Aftershock. I've just started playing the Aftershock title in the past couple of weeks. So far the gameplay is very close to XCom with some changes both tactical and strategic. Two improvements I've noticed is the addition of two new (and maybe a third) unit races you can add to your teams and during missions the action is almost real-time if you want. Not so great changes are primarily strategic. Research progresses very slowly through a huge technology tree. New bases are earned, not purchaced. And the economic engine is resource based as an alternative to currency based. I've built up a good supply of savaged weapons without ammunition and no way to "sell" them.

Torrents are your friend if you want to trial the game.

And CENEGA announced a third UFO game call Afterlight to hit stores February 9, 2007. This one will not have any underwater missions - they're going to Mars.