Wow, that's a cool list. It includes several that I've never seen before and can't find it my Middle-earth atlas or encyclopedia. Apysaic and Atliduk?? Labba, Logathig, Nahaiduk?? Umitic, Varadja, Waildyth?? What are they...and do these come from Tolkien's anciliary writings, or just products of fan imagination? (They sure sound cool.) What is the source of "Bethteur" as the actual name for Silvan (I've always wondered what it's real name was!)?
I can think of a few other languages of Middle-earth, although I only know them by "common" terminology (perhaps some of those names above are the technical names): Northern Mannish (the archaic tongue of the men of Dale and Northern Rhovanion, related to Rohirric), Lossoth, Bolchoth, and Dunlendish. And if you want to go beyond normal speech, there's also Entish and the tongues of birds (the ravens and thrushes).
Scottomir's LOTR Game Resources:
http://www.geocities.com/scott_metz/