This article is from the Artificial languages FAQ, by Rick Harrison rico_harrison@yahoo.com with numerous contributions by others.
Assembling and maintaining an all-inclusive list would be
difficult or impossible. The list-of-links pages mentioned below
will get you started. They also mention a variety of relevant
mailing lists and other resources. Spending some time with a good
search engine can also unearth dozens or hundreds of constructed
language projects.
http://www.sys.uea.ac.uk/~jrk/conlang.html
http://www.langmaker.com/
 
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