Execode is a Python interpreter that I wrote. Both the open source and the compiled versions are 5 KB.

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  Open Source

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   Compiled

    Copyright © 2005 Dustan Levenstein.
    You may download my program, but don't distribute it.
    You may share it with a few people face-to-face, but
leave it as-is; only modify it for personal use.
    If you really want to distribute it to people from a
distance, tell them the URL to which they must go.
    Don't use this logo elsewhere, and be sure not to
modify it when sharing it with those 2-3 people
face-to-face.
    Is this logo already in use? I don't want to infringe
on copyrights, so please tell me!
    Other questions? 'Use your common sense', that's the
phrase lawyers need to learn.