Committed

Justin William's new app is the kind of simple — insanely useful — idea that all developers wish we had more of. It's called “Committed,” and what it does is notify you (using Notification Center in Mountain Lion) whenever someone pushes commits to a GitHub repo you share. If you work on a lot of different projects sort of simultaneously like I do, there’s no excuse for not spending the $4.99 to buy it right now.