CnCNet

CnCNet is a modern gaming network that allows you to easily play the C&C classics (Command & Conquer, Red Alert, Tiberian Sun and Red Alert 2 even with their expansion packs) online with other people.

Playing online requires no registration. The only thing you have to do is drop a few files into your game folder, start CnCNet and join a network game!

CnCNet homepage[cncnet.org]