2
OpenXcom Developers
151
Open source
It is an open-source clone of the original UFO: Enemy Unknown game.
4
Sean O'Connor's Windows Games
4
Shareware
In Windows Games UFOs you have to grab the crystals and dodge the enemies.
7
UFO:AI Team
370
Open source
UFO: Alien Invasion is a squad-based tactical strategy game.
5
The Unknown Horizons Team
357
Open source
2D realtime strategy simulation with an emphasis on economy and city building.
7
Game Vindicator
245
Freeware
Game Vindicator 1.1 is a free software developed to avoid unfair gameplay.
1
ALTAR Interactive
224
Shareware
UFO Aftermath is a tactical game where you must repel an alien invasion.
1
Firaxis Games
770
Commercial
XCOM 2 is the sequel to XCOM: Enemy Unknown, strategy game.
Firaxis Games
432
Commercial
XCOM: Enemy Within is the expansion of the strategy game XCOM: Enemy Unknown.
Long War Studios
49
Freeware
Long War is a free mod for the 2012 game XCOM: Enemy Unknown.
Markus Persson
8
Freeware
A java game in whitc users shoot or avoid the enemies.
TacticalSailing
Shareware
TacticalSailing is a sailing Java game for windows.
1
xehonk
7
Freeware
It is an overhead view shooter in which you are caught in an unknown enemy base.
MyPlayCity, Inc.
40
Freeware
Set the town free from an unknown enemy in this first person shooter.
Falco Software Company
8
Freeware
Peaceful lands are invaded by an unknown enemy.
Falco Software Company
4
Freeware
The commander, our ships, met a new unknown enemy in the galaxy.
Falco Software Company
Freeware
An unknown enemy turned everyone who was on the space station into cyborg zombies.
