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RETRO is a Forth dialect. Retro 12 is built around the Nga virtual machine. At the lowest level Nga implements a lightweight MISC-based processor.

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    This is nice. I see some features of concatenative languages like Joy and Factor are introduced. For example, quotations:

    Quotes are another big design element. These are anonoymous, nestable blocks of code that can be passed between functions.

    Example:

    #10 #2 [ #33 * ] dip

    Also nice to see the site itself is implemented as a gopher server written in Retro.