Singularity Boards

A multiuse game board that can play nearly all of the games in the Kris Burm's GIPF series of games. The board works with dvonn, gipf, tzaar, yinsh, and zertz (although zertz doesn't really need a board, so this is cheating a bit). If interested you can learn more about the GIPF series at http://www.gipf.com/.
The Grand Camelot Board combines a Camelot, Grand Camelot, Go, and 10 by 10 grid board for amazing gaming goodness. The pieces used for these games can be combined to play an even greater variety of games.

About as classic as a board can get: the grid. Here you will find two boards, one with an odd and one with an even numbers of squares. There are an amazing number of games designed to be played on the humble grid.