Lojban: The Logical Language
Information about the carefully constructed spoken language designed in the hope of removing a large portion of the ambiguity from human communication.
Collection of articles, translations, and original compositions about and in Loglan, an artificial language invented by James Cooke Brown.
Wikipedia: International Auxiliary Language
Contains information about various constructed languages designed for communication between people who do not share a common native language.
How to Build a Language
Discusses the evolution of several attempts at constructed international languages.
Constructed auxiliary language based on the major living Romance languages and intended for international communication among speakers of those languages.
Campaign to agree on and spread the idea of a world auxiliary language.