From the website:
Next 10 created the nonpartisan California Budget Challenge in 2005 as a public service to educate and engage Californians on the trade-offs and tough choices involved in building the state’s General Fund budget of $105 billion. Over 50,000 Californians have taken the Challenge and groups are using it regularly across the state.
The Challenge has been a great success for Next 10 and for all Californians, and we want to share it with others! Whether you are looking at the budget of a city, state, or school district, you can license the Budget Challenge and create your own version of this interactive tool.
From their overview sheet:
Survey administrators are able to enter unique and customizable spending and revenue questions, policy options, and more. Each time the survey is taken, there is an introductory page that collects demographic and response data for each entry that can be exported for further analysis, and can be integrated with Google Analytics. Surveys can be offered in multiple language options.
A sample budget simulator challenge created for the city of San Francisco can be found here.
The Next 10 Budget Challenge is developed by Next 10, an organization based in San Francisco, CA.