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• Full-Featured and Flexible Modeling Platform. OpenSim allows you to build models of a broad range of musculoskeletal structures and many other mechanisms. Models can include any combination of rigid bodies, simple and complex joints, constraints, springs, dampers, contact, controllers, muscles, and other actuators.  The graphical user interface (GUI) allows you to load and visualize your models, and edit any of their properties.
  
  

• Muscle Models. OpenSim’s Hill-type muscle models capture the active and passive force generating properties of muscles and are based on well-tested models of muscle-tendon dynamics from the literature.
  
  
• Musculoskeletal Model Library. OpenSim ships with a set of extensively validated musculoskeletal models of the upper and lower extremities. In addition to research-grade models, there are simplified models for prototyping and teaching. Our online model library includes user-contributed models.

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• Common Modeling and Simulation Platform. Models and simulations developed on the OpenSim platform can be shared with and reproduced by others. The ability to reproduce and verify or extend the results of scientific publications is vital to research.
  
  
• Free Software for Research and Teaching. OpenSim is free and available to anyone with an internet connection and an account on simtk.org. This enables users to quickly and easily bring their innovations to the world. It also makes OpenSim an ideal teaching tool for biomechanics courses.
  
  
• Permissible Software Licenses. The OpenSim software platform is open to both academic and commercial applications. We welcome users from academia, clinical labs, consulting and design firms, and more. The OpenSim Application Programming Interface (API) is fully open source under the Apache 2.0 license. 

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