GitHub Visualizer - Enter user/repo and see the project visually
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
SyntaxDB - Easily look up programming syntax for multiple languages
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.
Codeology - Open-source algorithm that visualizes GitHub projects
Pomodone - Pomodone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service.