TLDR
Webots is an open source robot simulator that provides a complete development environment to model, program and simulate robots. Thousands of institutions worldwide use it for R&D and teaching. Webots has been codeveloped by the Swiss Federal Institute of Technology in Lausanne, thoroughly tested, well documented and continuously maintained since 1996. The robot program is implemented to e-puck robot. In this simulation, we used 40 robots, and 4 targets. It's very easy to learn and use, complete tools, and realistic. I don't need to spend any money to buy real robots.via the TL;DR App
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