OpenSim

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About

OpenSim is a free, open-source platform for modeling and simulating how humans, animals, robots, and their surroundings move and interact. Its graphical interface displays models and supports creating and analyzing simulations. Models can represent rigid bodies, joints, constraints, contact, muscles, and other actuators. For movement analysis, tools cover inverse kinematics, inverse dynamics, static optimization, and forward dynamics; Computed Muscle Control can produce muscle-driven forward simulations. Developers can use its API through Matlab, Python, Java, or C++, and script the GUI with its embedded Jython shell. Plugins can add analyses and model components, but must match both the OpenSim version and platform. The GUI is available for 64-bit Windows and Mac, while Linux users can build the API from source; there is no public Linux GUI distribution. OpenSim includes documentation, tutorials, and a discussion forum, and is intended for research, teaching, academic, and commercial applications. The free plan is $0.00 USD per free; download requires a SimTK account.

Who it is for

OpenSim suits researchers, educators, and teams modeling movement or interaction across humans, animals, robots, and their environment. Its API and GUI support users working across Windows, Mac, and Linux API builds.

What is good

Models bodies, joints, muscles, and other actuators
Movement analysis includes inverse and forward dynamics
API supports Matlab, Python, Java, and C++
Documentation, tutorials, and discussion forum available

What to know first

No public Linux GUI distribution
Plugins must match version and platform
Download requires a SimTK account

Verdict

OpenSim combines detailed movement modeling and analysis tools with an open-source API and graphical interface. Linux users can build the API, but the GUI is not publicly distributed for Linux.

Compared on physics simulation software

Free plan: Yesgithub.com
Delivery mode: desktopgithub.com
Lesson library: Yesgithub.com
Authoring tools: Yesgithub.com
3D visuals: Yesgithub.com
Data export: Yesgithub.com

Facts

Purpose: OpenSim models humans, animals, robots, and the environment, and simulates their interaction and movement.opensimconfluence.atlassian.net · 30 Sept 2026
Interface: OpenSim includes a graphical interface for visualizing models and generating and analyzing simulations.opensimconfluence.atlassian.net · 30 Sept 2026
Modeling: Models can include rigid bodies, joints, constraints, contact, muscles, and other actuators.opensimconfluence.atlassian.net · 30 Sept 2026
Movement analysis: OpenSim provides tools for inverse kinematics, inverse dynamics, static optimization, and forward dynamics.opensimconfluence.atlassian.net · 30 Sept 2026
Muscle simulations: Computed Muscle Control can generate muscle-driven forward simulations of movement.opensimconfluence.atlassian.net · 30 Sept 2026
Scripting: The API can be used through Matlab, Python, Java, and C++, while GUI scripting uses an embedded Jython shell.opensimconfluence.atlassian.net · 30 Sept 2026
Extensibility: Plugins can add analyses and model components, but must be built for the same OpenSim version and platform.opensimconfluence.atlassian.net · 30 Sept 2026
Data import: OpenSim 4.0 added support for reading marker and force data in C3D files.opensimconfluence.atlassian.net · 30 Sept 2026
Supported systems: The GUI is distributed for 64-bit Windows and Mac; the documentation says there is no public Linux GUI distribution.opensimconfluence.atlassian.net · 30 Sept 2026
Linux API: The API source can be built for Windows, Mac, and Linux.opensimconfluence.atlassian.net · 30 Sept 2026
License: The GUI and API are open source under Apache 2.0, while models, examples, and plugins may have their own licenses.opensimconfluence.atlassian.net · 30 Sept 2026
Support: OpenSim provides documentation, tutorials, and a discussion forum where users can seek help from experts.opensim.stanford.edu · 30 Sept 2026
Audience: The project describes OpenSim as suitable for research and teaching and welcomes academic and commercial applications.opensimconfluence.atlassian.net · 30 Sept 2026
Security: The pages reviewed describe OpenSim's software licenses but do not state security certifications or compliance programs.opensimconfluence.atlassian.net · 30 Sept 2026