GNU Backgammon - Plays and analyses backgammon games and matches
BGLightCE - BGLightCE, a Free Open Source Backgammon for Windows and Windows Mobile or Pocket PC
BGBlitz - BGBlitz2Go, a strong playing Backgammon for mobile phones
NetGammon - Play a free online Backgammon game against the computer or jump into a Quick Match.
Backgammon Blitz - Backgammon has arrived on Steam, in style! Loved by players the world over, Backgammon is a timeless two-player strategy game unlike any other.
bgammon.org - bgammon.org is where you can play backgammon online for free without any ads.