- A Survey of Venn Diagrams - Various facts and figures about Venn diagrams by Frank Ruskey.
- Algebraic Combinatorics via Finite Group Actions - A hypertext by A. Betten, H. Fripertinger and A. Kerber.
- ArXiv Front: CO Combinatorics - Combinatorics section of the Front for the Mathematics ArXiv.
- Catalogue of Lattices - A catalogue of different types with applications to packing spheres by Neil Sloane and Gabriele Nebe.
- CATS: Combinatorial Algorithms Test Sets - Searchable index of problems, links and methodology maintained by the Association for Computing Machinery.
- Combinatorial Catalogues - Combinatorial objects such as graphs, designs and geometries collected by Gordon Royle.
- Combinatorial Data - Brendan McKay's collection of miscellaneous tables in graph6 or sparse6 format.
- Combinatorics - Subfields in the AMS MSC 2000 classification 05.
- Combinatorics - MathWorld article with basic definitions and links.
- East Side, West Side - Lecture notes by Herbert S. Wilf on generating combinatorial objects and Maple.
- Encyclopedia of Combinatorial Structures - Searchable database of structures with specifications and counts.
- Enumeration of the Binary Trees - A note on Catalan numbers by Ivan Galkin.
- Extremal Combinatorics - With Applications in Computer Science by Stasys Jukna.
- G-Systems - Theory of chord structures to create music through algorithms by Vladimir Ladma.
- Generating Functions - Introduction to generating functions with interactive java applets by Alexander Bogomolny.
- Lectures in Combinatorics - An introduction to partially ordered sets, Dilworth's theorem, lattices and combinatorial geometries.
- On-line Dictionary of Combinatorics - An expanding web text by Joe Fields.
- Operational Research Programming Trivia - Computer code for research algorithms in operational research and combinatorial optimization.
- Series Expansions - Iwan Jensen counts polyominoes (aka lattice animals), paths, and various related quantities.
- The Combinatorial Object Server - Select a type together with specific parameter values and COS will return a list of all such combinatorial objects.
- The Combinatorics Net - Maintained by Bill Chen.
- The Cutting Sticks Problem - An unsolved combinatorial problem by Frans Faase.
- The Math Forum Math Library - Combinatorics - Comprehensive catalog of websites relating to Combinatorics.
- Topics in Mathematics - Combinatorics - In the Mathematics Archive at UTK.
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