Tulip software is a system dedicated to the visualization of huge graphs. It
manages graphs with a number of elements(node and edges) up to 500.000 on a
personal computer(PIII 600, with 256mo). Its SuperGraph technology architecture
enables to do the following things :
   * 3D visualizations
   * 3D modifications
   * Plug-in support for easy evolution
   * Building of clusters and navigation into it
   * Automatic drawing of graphs
   * Automatic clustering of graphs
   * Automatic selection of elements
   * Automatic Metric coloration of graphs

WWW: http://www.tulip-software.org/
