This is the homepage for GIDGET, the Gravitational Instability-Dominated Galaxy Evolution Tool, suitable for evolving gravitationally unstable star-forming disks over cosmological timescales.
An old version of the code is available for download here. That version of the code was last updated March 20, 2012 - it runs the models and analysis that go along with Forbes, Krumholz, and Burkert (2012) .
You are also free to modify the code and redistribute it. If you run into any difficulty adapting the code to your own research, I am happy to help!