NSOverlord

Roller derby app including Jam Timer and Penalty Box Timer.

Tired of stopwatches? NSOverlord's virtual timers make it simple for non-skating officials to clock games in roller derby.

Application consists of two timers for jam timer and penalty box timer positions. Box timer is able to pick one of three different layouts: two blockers, jammers or all six players. Jam timer can also track timeouts and official reviews.