SLiM

SLiM is a genetically explicit forward simulation software package for population genetics and evolutionary biology. It is highly flexible, with a built-in scripting language, and has a cross-platform graphical modeling environment called SLiMgui.

https://github.com/MesserLab/SLiM
Documentation
Latest release: v3.6 6 months and 3 weeks ago

Overview:

SLiM is a forwards-time population genetics simulator capable of simulating arbitrarily complex evolutionary scenarios. The underlying individual-based simulation engine is highly optimized to enable modeling of entire chromosomes in large populations. There is also a graphical user interface for easy simulation set-up, interactive runtime control, and dynamical visualization of simulation output.

Contributors: