Gazebo Robot Simulator
Gazebo simulates multiple robots in a 3D environment, with extensive dynamic interaction between objects.
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SimScale
SimScale offers a software that allows you to perform CFD, FEA, and Thermal simulations to your CAD model in the cloud without needing high-performance computing power.
Webots
Webots is a development environment used to model, program and simulate mobile robots. With Webots the user can design complex robotic setups, with one or several, similar or different robots, in a shared environment.