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.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
keezy - A colorful soundboard. Play with music.