Download ChessWorks 3.0 for Mac from our website for free. The program lies within Games, more precisely Strategy.
From the developer:
ChessWorks is a 3D chess game that was created especially for the use of playing multi-player games across the Internet or on a local network.
You may want to check out more software for Mac, such as BattleDuel, Voodoo Whisperer- Curse of a Legend - Collector's Edition or Castle Defense, which might be related to ChessWorks.