rayGina is a C++ operating-system independent raytracing library, which provides interfaces to extend the raytracing process while runtime and represents a framework for raytracing experiments/development of different components
Xi3D is an X3D renderer and browser for 3D Web content. It contains compliant parsers for VRML'97 types, a java scenegraph, XML bindings using SAX2, a content converter, full runtime and event model, DOM Level 2, vecmath