SML On Stilts
stilts.j4cbo.com
stilts.j4cbo.com
ColdFusion on Wheels (http://cfwheels.org/)
DOS on Dope (http://www.secretgeek.net/dod_intro.asp)
Haskell on a Horse (http://haskell.on-a-horse.org/ -- site seems to be down)
Cobol on Cogs (http://www.coboloncogs.org/ -- not actually real)
The $LANGUAGE on $NOUN naming convention amuses me. Any others I'm missing?
Another one I'd like to see is Node on a Dirt Bike.
Not a project in the sense that it has a community (thankfully) but the code is real.