GNU Backgammon is a strong backgammon program (world-class with a bearoff
database installed) usable either as an engine by other programs or as a
standalone backgammon game. In addition to supporting simple play, it
also has extensive analysis features, a tutor mode, adjustable
difficulty, and support for exporting annotated games. It can be played
either from a GTK+ graphical interface, optionally with a 3D board, or
from a simple text console.
GNU Backgammon is still under initial development and should be
considered beta software.
source: ubuntu package description