Torque3D
MIT Licensed Open Source version of Torque3D from GarageGames
...As a mature and full-featured engine, Torque3D provides developers with a comprehensive editor suite that supports terrain sculpting, environment creation, and complex scene design, alongside powerful tools for materials, particle effects, and visual scripting. It has robust support for physics, animation, lighting, shaders, and networking, making it suitable for a wide range of 3D applications from driving simulators to multiplayer games and interactive experiences. Using modern shader pipelines, support for COLLADA and other model formats, and advanced rendering techniques such as deferred lighting and volumetric effects, Torque3D allows creators to build visually rich worlds that can be deployed on Windows, macOS, Linux, and even the web.