Ages coming to my mind: Takla Makan, Sonavio, Oolbahnneea, Adrael. Reportedly, Turtle Isle is also of such kind.
However, I second Luna's question: What are you actually trying to achieve? Something like an easy to install way to get some awesome fan-ages into a plain Uru TPOTS?
Also, Drizzle is a tool that works out of the game, so making it part of the expansion pack does not make much sense (unless you want to use Drizzle to do parts of the expansion pack setup process). The Offline KI on the other hand, which could be considered an "Uru extension", is already something like an expansion pack on its own