This site exists to promote languages which are in development or have not yet reached a wider audience. This includes languages that do not ever intend to reach a wider audience, but are being developed for fun, learning, academdia or for no good reason at all.

See also:

• programming-languages, awesome-programming-languages: GitHub lists.
• PLDB: biggest list by far, but sporadic info and not always accurate.
• Wikipedia’s list: will have more older languages and every mainstream one.
• language study: another random list of language concepts and languages along with their origins. Very old, but a good resource particularly for the history.