Remember Command and Conquer I do. We spent many hours in the dorms at Marshall playing C&C (especially over the LAN). Well, it turns out that it has been released as free to celebrate the 12th anniversary of the game. Snag your own copy from here.
[Update 2012-12-26 15:56:21] The download link was broken. It did point to http://www.gamespot.com/pc/strategy/commandconquer/download.html?sid=6178099 but I’ve removed it.