R.E.A.R.M. - "Rearmament Expansion And Redesign Mod" is an unofficial Homeworld 2 expansion and it adds number of new interesting and various units.
A great mod for those wishing to extend they're homeworld experience. All the ships fit in very well, and is in fact one of the more balanced mods out there. The only real issue with it is that it isn't completed yet (and is still in alpha). Which makes one wonder what it will be like when it's complete (Don't stop working on this mod!)
Granted the developer is a wee bit disorganized but when you find a mod developer that isn't let me know (Which invalidates it as a point to take away from score)