Re: X-COM fanatics Unite
 

http://ufoai.net/

http://www.projectxenocide.com/

Two remakes.

Re: X-COM fanatics Unite
 

How about Giana Sisters? :D

Re: X-COM fanatics Unite
 

http://www.lemon64.com/giana/

Has a download for it, needs a C64 emulator.

Re: X-COM fanatics Unite
 

x-com: terror from the deep... :) ah the good ole gaming days before having a life (with all its little nuisances like i.e. a job). I remember many hours of happiness with that great game!

[edit]
I played a remake, UFO:AI mentioned above. It was ok but was... different, less tasty so to speak. Some original games cannot be "remaked"