Mouse right-drag or wheel to zoom.
Click node to select it.
b boxes everything.
h to toggle highlight mode.
p to select all paths between selected point and hover.
d to toggle directed edges.
a to select all paths reachable under hover.
Left tab is matrices. Right tab is eigenvectors.
Spectral layout, coloring and sizing for graphs and XML files. To explore XML files, download the source.
Controls (for more click the help tab atop)
Mouse : zoom, rotate, drag, click to select and make paths
Keys: e (toggle edges), v (toggle vertices), h (toggle highlight mode)