Factor (http://factorcode.org) is an expressive, fast and full-featured Concatenative language invented by Slava Pestov. The Factor implementation is released under a BSD license and runs on most common platforms.
Factor has been in development since September 2003, with a strong focus on practical programming all the way through; it began as a scripting language for a game. Factor has a small but friendly and vibrant community, and it is easy to learn.
Documentation:
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