A Developer Jamboree covering advanced topics in OpenSim. This is an opportunity for software developers to learn more about how OpenSim works "under the hood" and get supervised, hands-on assistance with problems you bring to the workshop. A conceptual overview of the OpenSim API (Application Programming Interface) will be provided, followed by sessions where participants work on problems they bring to the workshop. Advanced OpenSim users may also attend and work on their research problems. For example, participants generate simulations from motion capture data collected in their lab, add arms to their gait model, or write a new muscle model or controller. Participants will have the opportunity to work in small breakout groups with OpenSim experts on these problems.