Bibliography of Planned Languages (Excluding Esperanto)
- List of books on interlinguistics, Volapük, Ido, Ro, Occidental, Novial, Interlingua, Glosa, modified English and Latin, pasigraphies, number languages, and other planned languages.
- http://www.rickharrison.com/language/bibliography.html

Conlang Free City
- This Conlang Wiki is devoted to the topics of ConLangs and ConCultures. This is an online resource and communnity about Conlangs that you can edit.
- http://conlang.wikia.com/wiki/Main_Page

Studoj pri Interlingvistiko / Studien zur Interlinguistik
- Journal article by Wim Jansen that reviews a book on language planning and language policy by Sabine Fiedler and Liu Haitao. The book is on the theoretical and applicational aspects of interlinguistics, esperantology, terminology and lexicography.
- http://esperantic.org/librejo/dbstudoj/index.htm

Conlangs DE-Cal
- A class on constructing languages at the University of California Berkeley.
- http://www.livejournal.com/userinfo.bml?user=conlangs_decal

Constructed Languages
- An encyclopedia entry describing constructed languages, including sections on auxiliary languages, artistic languages, and logical languages.
- http://en.wikipedia.org/wiki/Constructed_languages

Universal Language Dictionary Project
- An attempt to create a list of concepts, described in English, along with words to express those concepts in several natural and artificial languages.
- http://ogden.basic-english.org/dicintro.html

Earth Minimal Language
- Complete 220 word second compact language.
- http://ebtx.com/lang/eminfrm.htm