Tolkien Language and Literature Resources
Khuzdul - the Secret Tongue of the Dwarves.
List of Tolkien's Languages
List of Tolkien's Languages: Quenya - The Ilkorin Dialects - The Noldorin Dialects - Dialects of the Lembi.
The Tolkien Language List
The Tolkien Language List - Miscellaneous useful things - TolkLang messages - The Elfling and Lambengolmor mirrors.
Tolkien invented at least five major alphabets with many variations.
Here is a short list of some things to help people learn Tolkien's languages, mainly Quenya and Sindarin, since so many people ask. T