Alpha Dictionary Language Directory
http://www.alphadictionary.com/langdir.html

Of the roughly 6,800 known languages and dialects spoken in the 191 countries of the world, only 2,261 have writing systems (the others are only spoken) and about 300 of these have online dictionaries. You can search for them on Google and wade through 50 million mostly irrelevant returns or quickly peruse the cream of the crop at alphaDictionary. They carefully select and add new dictionaries, grammars, and LANGUAGES regularly. This has been added to Reference Resources Subject Tracer™ Information Blog.