Fretello - Duolingo for learning how to play guitar
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Justin Guitar - Over 750 completely free guitar lessons!
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.
Uberchord Guitar - Get better on your guitar. Fast.
Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.