For Empire Deluxe Enhanced Edition see Killer Bee software at
http://www.killerbeesoftware.com/kbsgames/edee/
I don't know how they might or might not be related to previous producers of Empire games.
Oh, and as for Remote Assault, I think it is a very well done combined-arms real-time tactical game. I find the AI quite difficult to beat, perhaps largely because I haven't mastered the tactics, and it seems to use them pretty well. In theory, I should play it a lot more than I do - it was only really the setting which didn't grab me.
PvK