22tracks - DJ curated Spotify playlists on iOS
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.
Noiseblend - One-tap music for every occasion, with Spotify Premium
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Spotify - Map shows when two people play same song at same time
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.