The Collaborative Cross Simulator will provide both data and visual simulations for the collaborative cross experiment. The simulator creates synthetic founder mice and breeds them in the CC Funnel scheme to produce an synthetic inbred line of mice. Using computer simulated cross-over and breeding events, the G1, G2, and G2:Fx mice are created. The simulator will provide a powerful tool for the community by allowing them to generate synthetic lines and populations. Using these synthetic mice, researchers can compare actual mouse data against statistically neutral and random data.