The Year Zero Engine is a simple RPG system with an open license that you can do a lot with. Put out by Free League Publishing in their RPG Mutant Year Zero it has been adapted for a lot of other games like Coriolis. You can get a quick feel for the core concepts and mechanics for free from checking out Year Zero Mini, a generic simplified version of the system capable of making anything your imagination can come up with. That can be found at www.9littlebees.com. As always, check out that we are doing at www.wobbliesandwizards.com our blog, and give us a good review and follow on whatever platform you listen to the Wobblies & Wizards Podcast on.