Linux Show Player - Sound player designed for stage productions
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
QLab - QLab, Live show control for Mac OS X.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Trigger Audio and Video Playback - Audio and video cue player for broadcast and live performance.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.