BGLightCE
BGLightCE is a free open source backgammon for Windows Mobile or Pocket PC, based on Gnu Backgammon. It features the strongest backgammon opponent available for the Pocket PC (as far as I am aware!). Features include match play and different playing levels, various board and checker sets, and move evaluation and hints. If you are bored and tired of beating other PocketPC backgammon games and are looking for more of a challenge, then BGLightCE is for you. The move generation and evaluation engine for BGLightCE is ported from bglight. According to Joseph Heled, the author of bglight and a contributor to GNU Backgammon, its playing strength is equivalent to mgnu_zp playing on FIBS, which is around 1950.
