Well, sites for first two are:
www.eaglered.net - Eagle Red
(not sure, although it worked while ago)
http://dynamic5.gamespy.com/~ar2/index.php - AR2 (site is currently unavailable)
You can also find both on CnC Files:
http://commandandconquer.filefront.com/
As for Reloaded, it hasn't been released yet
