Mods
Command & Conquer Minecraft
Worth a Look? : YES!
Do you love Command & Conquer?
Do you love minecraft?

Ever wanted to see what a Particle Cannon or a MARV look like made out of blocks?

Look no further! C&C Minecraft brings special servers and skins for you to play with, and add to the command and conquer community. To get all the details on this, check out their official site!
Tiberium Essence (for C&C 3: Tiberium Wars)
Worth a look? : YES!
Tiberium Essence is an amazing mod to play. Featuring a nice mix of old school units from Tiberium Sun, with new and improved looks, as well as many NEW units, upgrades, maps.

Everything you could want from a mod, and everything works in single player mode too, so it gives you a reason to play through again, and try out the new arsenal!
Version 1.51 beta can be found on their mod DB page. You can also get it through Desura too if you have it