Abstract Strategy Games
   An index sorted by letter and author. Includes pictures, game descriptions, and rules.
   http://www.abstractstrategy.com/

Setup Group Inc.
   Information on classic games. Includes information on variants, rules, and history.
   http://www.setupgroup.com/xo/

The World of Abstract Games
   A collection of more than one hundred of the purest abstract games from all over the world. All these games can be played with very few material on a regular board.
   http://www.di.fc.ul.pt/~jpn/gv/