GENEPOP is a population genetics software package originally developed by Michel Raymond (Raymond@isem.univ-montp2.fr) and Francois Rousset (Rousset@isem.univ-montp2.fr), at the Laboratiore de Genetique et Environment, Montpellier, France. The latest version of Genepop (4.2) is now available from http://kimura.univ-montp2.fr/ rousset/Genepop.htm. Genepop 4.2 runs under Windows, and can also be compiled to run under Unix or Linux. It will compile on Mac OSX machines if you have the developer tools installed.