Quines

A GNU Make Quine
This is a quine written for "make", specifically the gnu version.
http://japple.freeshell.org/code/quines/

The Quine Page
Examples of self-reproducing programs in various languages, with some extensions, including polyglot quines, iterating quines, and quine generators.
http://www.nyx.net/~gthompso/quine.htm

Quines
An essay on quines, programs which produce their own listing as output.
http://www.madore.org/~david/computers/quine.html