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 very well made mod and new units blend in seamlessly with the original vanilla ones. my only problem is that when you have a lot of units onscreen the original textures and models pixelize and is not the best for recordings.
the latest version is pretty bug free except the kadeshi. i cannot seem to get them working but overall an excelent mod even in early stages.