Naturally this means the Scrin are a bit underloved compared to GDI and Nod. Don't expect thematic consistency, but it's quite fun seeing the old-school stuff reinterpreted in the C&C3 engine. Tiberian History ( ) on the other hand, is more of a 'What if we had units from various C&C games all mashed into one mod' sort of thing.
Tiberium Essence ( ) is a complete overhaul that changes the game to be a bit closer to Tiberian Sun in theme.