Project Chrono is an open-source physics-based simulation engine geared toward aiding in the design, analysis, and optimization of complex systems. This software framework accommodates a wide range of applications, including vehicle dynamics, robotics, biomechanics, and aerospace engineering, but is particularly noted for its robust capabilities in simulating multibody dynamics.The engine provides tools for system modeling, including rigid and flexible body dynamics, collision detection, and handling various interaction types such as contacts and constraints. Users can enhance their simulations with additional modules like vehicle dynamics, finite element analysis, and sensor simulation, making Project Chrono versatile and adaptable to various computational mechanics needs.Detailed documentation and examples hosted on the project's website, https://www.projectchrono.org, serve as valuable resources for both novice and advanced users. The platform encourages collaboration and community involvement, allowing users to contribute, share, and discuss different aspects of their work in simulation science.