I am using the Hang drum samples from Sonic Couture - I think they're well done. Its put together as a Kontakt instrument. Good stuff. Kontakt 3 has glockenspiel, celesta, african shakers, ewe-toke, kalimba, hammered dulcimer, lots of good stuff. You might want to look at Kontakt 3.
For Udu, I've had fun with my old Planet Earth module from EMU. The Planet Earth module has lots of good stuff. The module is not being made anymore, but if you're lucky you can find one second hand.