Using Google Earth, you create a new island on earth, design a flag, elect a government, develop laws, and even create a new town. They’ve created quite a few tutorial videos on how to work with the software, such as this video to help you get started:
Classroom Copilot has a variety of other games and tools, such as a phonics-based Guitar Hero clone and a tool that uses 3D paper for some cool effects.
For classrooms that create imaginary worlds in an effort to show how all aspects of a society come together, A New Life would be a great addition to the class. Learn more and try it for yourself here.