SlyderEST said:
Also, why don't I see X-com on that list? It has 3 games... Or more. If you won't count the unofficial ones then the third one is coming out eventually!
It were 5 official games by MicroProse:
UFO: Enemy Unknown (Round based strategy)
XCom: Terror from the Deep (Round based strategy)
XCom: Apocalypse (Round based strategy with optional pausable Realtime)
XCom: Interceptor (Wing Commander-like flying with XCom-like basebuilding)
XCom: Enforcer (Third person shooter. Bad, but hilarious.)
There is also the UFO series (Aftermath, Aftershock, Afterlight) that is very similar, but not part of the IP.