Yahoo! Games - Backgammon Ladder
Ladder and Java-based server for backgammon and other games.

BBYL - Bulgarian Backgammon Yahoo! League
Backgammon League for Bulgarians.

Eliters Divisions System (EDS) - Backgammon Yahoo
Based on Divisional alignments and contested in two Play Periods each month. Players are seeded into Divisions of 10 Players each, and at end of each Play Period the Divisions are realigned based on performance in the just-completed Play Period.