Data and Software

Editors 101
 Andries Brouwer's
descriptions
of various interesting graphs and his tables of
parameters for strongly regular graphs.

Gordon Royle
 cubic and strongly regular graphs, biplanes,...
 Ted Spence
 strongly regular graphs, 2designs, Hadamard matrices, twographs,....

The Stony Brook Algorithm Repository.
 Brendan McKay
 some very useful programs (nauty, gtools, etc.) and some
vertextransitive cubic graphs.
 Markus Meringer's
regular graphs.
 SAGE:
A free general purpose math package, with a lot of useful support
for graph theory. It also provides access to many other useful packages.