1)   2007 Backgammon Pro 5.3
This is the most featured backgammon game available today. It has realistic OpenGL-compatible 3D graphics. There is an online system to play against thousands of players worldwide. Professional version has improved neural nets based AI.

 2)   2007 Backgammon 5.01
This backgammon game has realistic OpenGL-compatible 3D graphics - you can view the board from any angle. You can play against the computer or with your friends and there is an online system to play against thousands of players worldwide.