Amazing Mathematical Object Factory - Generators for several basic combinatorial objects by Frank Ruskey and Scott Lausch. www.schoolnet.ca/vp-pv/amof
ArXiv Front: CO Combinatorics - Combinatorics section of the Front for the Mathematics ArXiv. front.math.ucdavis.edu/math.CO
British Combinatorial Committee - Conference listings, bulletin and links maintained by Peter Cameron. www.maths.qmw.ac.uk/~pjc/bcc
CADCOM - Committee for the Advancement of Discrete and Combinatorial Mathematics. www.dms.auburn.edu/~rodgec1/cadcom
Catalogue of Lattices - A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe. www.research.att.com/~njas/lattices
CATS: Combinatorial Algorithms Test Sets - Searchable index of problems, links and methodology maintained by the Association for Computing Machinery. www.jea.acm.org/CATS
Combinatorial Catalogues - Combinatorial objects such as graphs, designs and geometries collected by Gordon Royle. www.cs.uwa.edu.au/~gordon/data.html
Combinatorial Data - Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format. cs.anu.edu.au/~bdm/data
Extremal Combinatorics - With Applications in Computer Science by Stasys Jukna. www.thi.informatik.uni-frankfurt.de/~jukna/EC_Book
G-Systems - Theory of chord structures to create music through algorithms by Vladimir Ladma. www.sweb.cz/vladimir_ladma/english/music/articles/dide99.htm
Golomb Ruler Table - Lengths of shortest known Golomb rulers with up to 150 marks. www.research.ibm.com/people/s/shearer/grtab.html
Krawtchouk Polynomials Home Page - Properties and applications of these classical orthogonal polynomials by Vadim Zelenkov. zelenkov.isir.minsk.by:8101/orthpol
Small Association Schemes - Tables of homogeneous coherent configurations by A. Hanaki and I. Miyamoto. kissme.shinshu-u.ac.jp/as
SOMA Update - Leonard Soicher reports on new SOMAs, which are generalisations of mutually orthogonal latin squares. www.maths.qmw.ac.uk/~leonard/soma
Tables of Groups, Graphs and Maps - Catalogues of the mathematical objects produced using LOWX. www.math.auckland.ac.nz/~peter/mathdb
The Combinatorial Object Server - Select a type together with specific parameter values and COS will return a list of all such combinatorial objects. www.theory.csc.uvic.ca/~cos