To view this content, you need to install Java from java.com

Source code: graphviewer Command CommandRunner Graph Link Node

Commands (click on the applet to activate keyboard commands)

Click on Node: Bring it to the center.
Z: Decrease simulation speed.
X: Increase simulation speed.
V: View node IDs.
C: Show degree circle markers.
1: View all SearchConnections.
Up, Down, Left, Right: Move view.
+: Zoom in.
-: Zoom out.