ZGRViewer is a 2.5D graph visualizer implemented in Java and based upon the Zoomable Visual Transformation Machine.
It is specifically aimed at displaying graphs expressed using the DOT language from AT&T GraphViz and processed by programs dot or neato.
ZGRViewer is designed to handle large graphs, and offers a zoomable user interface (ZUI), as well as various focus+context navigation techniques, which enable smooth zooming and easy navigation in the visualized structure.
More info at:
http://zvtm.sourceforge.net/zgrviewer.html
Video demonstrations of the new navigation techniques:
http://zvtm.sourceforge.net/zgrviewer/video/videos.html
To download:
http://sourceforge.net/project/showfiles.php?group_id=63244&package_id=71953