CyberBoard is the most popular PBEM at this time.
This high quality shareware program by Dale Larson which
uses specially constructed "gameboxes" to allow you to play
any board game by email. The system allows you to easily
graphically design the various parts of a board game on your
computer. The players can make their moves and exchange
recorded versions of the moves with their opponents. The
opponent can then play back the moves. CyberBoard is not a
computer opponent. It provides no artificial intelligence
capability.
Gameboxes
Download
Alex Henderson has created many Gameboxes using
CyberBoard v3 for the game series. The following links let
you download them directly from his site Cry Havoc Games.
The Samurai and Dragon Noir 1 Gameboxs have been created by Marcos Hidalgo
Castle Construction Set - New!
Alex Henderson has designed this new Gamebox for CyberBoard
v3 to create your own castles using the various wall
elements of the Welsh Castle extension. A page of
explanations and examples has been posted on
his site.