A quine is a non-empty computer program which takes no input and produces a copy of its own source code as its only output. 1
Some pretty smart people on github build something called a Quine relay which is - as they put it - "a Ruby program that generates Scala program that generates Scheme program that generates ..."
Basically instead of outputting it's own sourcecode, it produces the sourcecode for the next language to run. And that for 100 different programming languages. Pretty cool.