CrossSim is a project mainly written in Python, it's free.
Some python classes for simulating genetic crosses
by Joshua Shapiro
A system for simulating genetic crosses.
The functionality is pretty basic, but it supports haploid or diploid individuals, tracking an arbitrary number of chromosomes.
Recombination is modeled either without interference, or with complete interference (one recombination event per chromosome), and all coordinates are on the genetic map.
TODO: