The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. VTK consists of a C++ class library and several interpreted interface layers including Tcl/Tk, Java, and Python.
M. Winikoff. Multi-Agent Programming: Languages, Platforms and Applications, volume 15 of Multiagent Systems, Artificial Societies, and Simulated Organizations, chapter 7, Springer, New York, NY, (2005)