GNU Backgammon - Plays and analyses backgammon games and matches
BGBlitz - BGBlitz2Go, a strong playing Backgammon for mobile phones
247Backgammon - Play the best Backgammon online for free with no signin required! Play backgammon immediately!
NetGammon - Play a free online Backgammon game against the computer or jump into a Quick Match.
BGLightCE - BGLightCE, a Free Open Source Backgammon for Windows and Windows Mobile or Pocket PC
Nextgammon - Your Ultimate Online Backgammon Destination!