AMPO administered the ActivitySim project for more than a decade before that role was taken over by the Zephyr Foundation in 2025. The mission of ActivitySim is to create and maintain advanced, open-source, activity-based travel behavior modeling software based on best software development practices for distribution at no charge to the public. The ActivitySim project is led by a consortium of Metropolitan Planning Organizations (MPOs), Departments of Transportation (DOTs), and other transportation planning agencies. The consortium provides technical direction and resources to support project development. All member agencies contribute to the effort and help to make decisions about development priorities.