To supplement ABL online Tournaments here are the following options:
Warp Gammon provides backgammon tournaments for players from around the globe in a variety of formats:
Round Robin, Progressive, Swiss, Team events and Annual Championships.
WarpGammon is committed to bringing the best backgammon competition possible to online backgammon players, in a fair and professional environment.
For more details go to http://www.warpgammon.com/
FIBS Tournaments are run for Australian players. Entry is $25 and tournaments are run monthly on demand. The current format is 8-player single elimination, 7 point matches.
For more details go to http://www.sydbg.uniq.com.au/fibs_rules.html