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After I found this story on programming.reddit.com I was too tempted to write a 500 lines of C code Tcl interpreter for fun, as commented here . It took three hours of work, 556 lines of C code, and was pretty interesting to do. The following is a description of the experiment. Unlike the lisp500 interpreter I wanted to use more or less my normal C style. Lisp500 isn't actually 500 lines of code, but 500 lines of human gzipped code ;).

picol, a Tcl interpreter in 550 lines of C code

http://antirez.com/page/picol.html
http://slatelanguage.org/

Slate Language

Slate is a prototype-based object-oriented programming language based on Self , CLOS , and Smalltalk-80 . Slate syntax is intended to be as familiar as possible to a Smalltalker, for the clarity of messages as phrases. Unlike the Smalltalk family, methods within Slate can be assigned to a signature of objects, instead of being installed on one favored receiver.
Since Zimbu builds and runs fast, an interactive demo has been made. This allows typing Zimbu code in your browser and the output (or compiler errors) show up immediately.

Zimbu programming language

http://www.zimbu.org/Home