There are many alternatives to GNU Backgammon for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is SimplyBG. It's not free, so if you're looking for a free alternative, you could try BGBlitz or JavaFIBS. If that doesn't suit you, our users have ranked more than 10 alternatives to GNU Backgammon and five of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to GNU Backgammon are Absolute Backgammon (Paid) and 247Backgammon (Free).
Play backgammon online against friends, real players. Choose your opponent. Play anywhere, laptop, tablet, mobile. Supports many features including doubling cube and Crawford rule, Jacoby rule. Easy to get started. Nothing to download or install.
BGBlitz is a strong neural net based computer player for Windows, Mac and Linux. BGBlitz, the Swiss army knife of Backgammon currently has the following "blades": Play Backgammon against a world class opponent or play over a network.