Mixxx - The most powerful free DJ software in the world.
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.
Traktor Pro - Flagship DJ software with four decks and a stunning range of creative features for maximum freedom in DJing.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
VirtualDJ - Virtual DJ Software - MP3 and Video mix software for DJs
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.