There a Jagged Alliance 2 mod that I just picked up the other day. I haven't had the chance to get everything installed and give it a try, but it sounds like it makes quite a few changes. Not sure if it included a no-cd executable or not -- which is one of my primary considerations.
http://ja2v113.schtuff.com/
Xcom 1 has been remade. I have it somewhere and just haven't gotten the chance to give it a try. There's also a speed-run of Xcom 1 which was pretty crazy to see.
As for the new game, it looks interesting. UFO:Aftermath looked interesting -- almost unplayable from all the crash and mission-critical bugs, but it had a few interesting things to it.