K-3D

K-3D is a free, open-source 3D modeling and animation software with a unique node-based architecture. It features procedural modeling, polygonal modeling, and animation tools with a focus on flexibility and extensibility. The platform supports plugins and scripting, allowing for custom workflows. It includes ray tracing rendering and can export to various formats. It's suitable for users who want a highly customizable 3D tool and are comfortable with node-based workflows.