Good News - Absolute Backgammon (including acey deucey) for the iPad is in the App Store!
App Store link to the iPad version of Absolute Backgammon
You can gift the game to someone by selecting "View in iTunes" then selecting the down arrow next to the button to purchase it.
Veiw the manual for it - Manual for Absolute Backgammon/Acey Deucey for the iPad and the iPhone
All of the games below (including David's Backgammon) work with all versions of OSX including Yosemite.
Absolute Backgammon - Download and try the newest backgammon game for the Macintosh. You
won't find a backgammon game with more attractive graphics or easier to use. There are many more board styles to pick from.
Can even play using just your voice.