The GitHub Matrix Screensaver - Latest commits from GitHub visualized Matrix-style
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Octohunt - Search to find developers in your city on Github.
GoodGantt - The best Gantt chart for Trello®
Github Profile Visualizer - Tool for visualizing GitHub profiles
Paws for Trello - The best way to use Trello on your desktop