This site covers 16 tongues of Arda, as well as 3 invented languages from Tolkien s youth. A great list of links to online resources is also available. What began as a project by Marc Okrand for the writers of Star Trek has grown into a serious scholarly exploration for many people. Here you can learn how to read and write Klingon and even find books in Klingon, including the restored Hamlet. A nice site for those interested in creating a language of their own.
Elements covered include phonology, grammar, mood, and vowel harmony.
Meant for entertainment purposes only for the creation of languages for fictional purposes. Language A report from author Diane Duane on how she creates bits of the Romulan language for her Star Trek novels. A great place to find information on the artificial language Esperanto. Pages are available in Esperanto, English, French, German, Spanish, and Russian. Here are some good starting points.