A Haskell program that prints out a Perl program that prints out...

[caustic]

http://blog.sigfpe.com/2011_01_01_archive.html

[bediger]

Apparently these are called "ouroboros programs". http://asiajin.com/blog/2009/09/22/uroboros-programming-with... (which serves an empty page to me right now) used to have a period-11 cycle of programs. I wrote a period-3 program (http://www.stratigery.com/source.html#Ouroboros).

[seles]

http://golf.shinh.org/reveal.rb?Quine/shinh+%28C+C%2B%2B+Rub...

Here is a 396 byte C program that prints a C++ program that prints a Ruby program that prints a Python program that prints a PHP program that prints a Perl program, that prints the original C program.

Coincidentally that program is the same in all languages :) it is a polygot. This is definitely a much harder problem than just cycling through the languages...