It is the year 2084. You control a secret organisation charged with defending Earth from a brutal alien enemy. Build up your bases, prepare your team, and dive head-first into the fast and flowing turn-based combat.
UFO: Alien Invasion is a squad-based tactical strategy game in the tradition of the old X-COM PC games, but with a twist. Our game combines military realism with hard science-fiction and the weirdness of an alien invasion. The carefully constructed turn-based system gives you pin-point control of your squad while maintaining a sense of pace and danger.
Over the long term you will need to conduct research into the alien threat to figure out their mysterious goals and use their powerful weapons for your own ends. You will produce unique items and use them in combat against your enemies. If you like, you can even use them against your friends with our multiplayer functionality.
UFO: Alien Invasion. Endless hours of gameplay — absolutely free.
The game takes a lot of inspiration from the X-COM series by Mythos and Microprose. However, it's neither a sequel nor a remake of any X-COM or other commercial title. What we as a team wanted to make is a brand new experience that tries to surpass the quality of games from 1992, rather than simply recreate them with flashier graphics.
We also believe that open-source projects don't need to be disorganised or badly-managed. We work together in a friendly and professional way, with a clear vision for a game that we know is worth playing.
UFO: Alien Invasion 
It is the year 2084. You control a secret organization charged with defending Earth from a brutal alien enemy. Build up your bases, prepare your soldiers...
Latest tweets from @ufoai
Our monthly development report for March is up: T.co
Apr 25 2013, 6:57pm
Woops, I sent a bad link in that last post. Our February monthly is better viewed here: T.co
Mar 27 2013, 8:33am
The February monthly is finally up. See what we got done in that cold, cold month: T.co
Mar 27 2013, 8:25am
We've only used the bug tracker @thebuggenie a short time, but we've found it invaluable in developing @ufoai
Mar 19 2013, 8:44am
FOSS bug tracking software @thebuggenie is looking for donations to continue development. please consider donating: T.co
Mar 19 2013, 8:43am
Christy+Gary Bonn released "Hive Mind", the first book in a series set in @ufoai universe. Read it @writerlotFree: T.co
Mar 14 2013, 8:44am
@Canageek We're always finding and fixing small pathfinding bugs in the maps, so it's possible, but no guarantees!
Feb 8 2013, 5:39am
Our latest monthly update is up. See what we got up to: T.co
Feb 6 2013, 11:40am
Vote for fellow open-source games @Cube2Sauer and @xeno74 (SuperTuxKart) in the @sourceforge project of the month T.co
Feb 6 2013, 9:38am
A big thanks to @thebuggenie for the open-source software we're using to run our new tracker.
Jan 29 2013, 12:50pm
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The text just shows up as "INTRO_1_TXT" and so on.
this game really dissappoints .... it's not even possible to start a campaign due to all the crashes and there are still tons of bugs....
Do you upload updatas anymore?
Can't even get it to launch. Apparently the dependencies on the Linux version are older than the pre-installed packages from Ubuntu 12.10. When I install the older ones, it hangs up. I'm using an older Dell Inspiron 530 with 4GB of Ram, and a dual-core at 2.5 GHz, give or take a hertz or two. Where do I send the log?
great game! i ran into a few bugs on while playing :P lol 1) when my interceptors clash with UFO it lags badly sometimes! 2) some civilians when killed just stand there with their head on teh ground XD kinda funny tho not really a problem. lol this is a great game and has a lil step up over the original XCOM. great work guys the detail in research is amazing! tech tree is great! lol i also saw some familiar weapons in the game too XD (halo mabye?) i love the auto-battle function altho i dont understand why certain UFO battles wont allow it. but thats okay might take the fun out of playing it anyways.
To top it off the maps are great also! some open and some real close quarters, im still playing to beat the full campain (great btw) :) this is really a great peice of work!
Sorry for the late reply. We don't check this page too often. You'll find more response over on the game's page. 1) has been fixed. 2) has been fixed, I think. Thanks for playing.
Great Free Game Available on everything! So the game is 3 parts "defend earth from aliens tycoon" and 2 parts "turn based tactical strategy"! Kukucov.blogspot.com
The game looks like a great improvement over the old X-Com, which I loved. My only problem is how to keep the game in the full-screen environment. When playing in full-screen mode, when the game switches from the strategic map to the tactical one, I am booted out of the game. When I play the game in windowed mode, it isn't a problem, but I'd like to play the game in full-screen mode. I've got win 7, 32 bit, running on i7 dual core with 4 gigs ram, and nvidia 250 with 1 g of video ram.
Help!!,I download the game up to less than .4 mb left to download then it just stops.What can I do??