Bartlett's Unfamiliar Model Language Summaries of lesser known modular languages written by Paul Bartlett. Afrihili, Eurolengo, Frater, Oz and Tutonish. http://www.langmaker.com/Bartlett.htm
Conlang Profiles at LangMaker.com A regularly updated directory of over 1,100 invented languages and neographies. http://www.langmaker.com/
Richard Kennaway's Constructed Languages List Notes and resource on both international auxiliary and constructed languages, a large collection of links. http://www2.cmp.uea.ac.uk/~jrk/conlang.html