There is a new umpire assigning software in town, Asportsmanager.com. This software has all the features horizon webref or arbitersports has except this one is free. The auto assign feature is amazing and also the friendly staff can set it up so that it will link your schedule to any league website's schedule so no more dealing game change emails. As an assignor I don't mind putting an extra 400-1000$ into my pocket instead of the pockets arbitersports. You should really check them out.