The Visualization ToolKit (VTK) is an open source, freely available software system for 3D computer graphics, image processing, and visualization used by thousands of researchers and developers around the world. VTK consists of a C++ class library, and several interpreted interface layers including Tcl/Tk, Java, and Python. Professional support and products for VTK are provided by Kitware, Inc.
Everyone's got their data in XML these days. You need to read it. You've looked at the other XML APIs and they all contain miles of crud that's only necessary when parsing the most arcane documents. Wouldn't it be nice to have an easy-to-use API for the normal XML documents you deal with? That's xmltramp:
Bow (or libbow) is a library of C code useful for writing statistical text analysis, language modeling and information retrieval programs. The current distribution includes the library, as well as front-ends for document classification (rainbow), document retrieval (arrow) and document clustering (crossbow).