K-3D is the free-as-in-freedom 3D modeling, animation, and rendering system. K-3D features a robust, object-oriented plug-in architecture, designed to scale to the needs of professional artists, and is designed from-the-ground-up to generate motion-picture-quality animation using RenderMan-compliant render engines. We strongly recommend the Aqsis render engine for use with K-3D. K-3D allows you to create and edit documents in multiple real-time OpenGL solid, shaded, texture-mapped views. You can even model, animate, and interact with animations while they play back for maximum productivity.