XISL (XML based scripting of Implicit Surfaces) package (written in C++) assists developers in construction of arbitrary implicit models. Each implicit function class (a primitive, an operation, etc.) is deffined by its appropriate XISL tag(s).
Open Source and Portable object oriented software for 3D digital image segmentation and visualization. Pipes and Filters Architechture.
Implemented in C++, and uses FLTK, VTK, ITK, TCL (plugins), and pipeline filters implemented in XML. DICOM support.
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