Free open source photo-realistic ray tracer.
Create POV-Ray files with Caedium Viz Export.
Free open source scanline Renderman clone.
Create Renderman files with Caedium Viz Export.
Resource for VRML standalone and browser plugin applications.
Create VRML files with Caedium Viz Export.
GNU Image Manipulation Program (GIMP). Freely distributed software for photo retouching, image composition and image authoring.
Blender is open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback.