BOTW Directory - Science > Math > Combinatorics

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Combinatorics Problems - Features challenging math Olympiad and combinatorics problems. Includes music and contact information.
Josh Cooper's Math Pages : Open Combinatorics Problems - Background information about the author and his email address. With papers and preprints.
Open Problems in Combinatorics - Provides information about the authors and their different combinatoric problem topics.
Past Open Problems - Presents searchable archive system for pre-publications. With a group newsletter in discrete mathematics.
Problems in Graph Theory and Combinatorics - Contains information about the resource for research in graph theory and combinatorics. With contributions and collections of the authors.
Some Problems in Matroid Theory - Contains problems found by the author, with samples for illustration. Includes sources and contact information.