Free OS X app to configure custom gestures for your trackpad

When you find your hand on the mac trackpad, this utility helps ensure that you don't need to leave it. Close the current window by swiping three fingers down. Show the application switcher by tapping four fingers. Open a link in a new browser tab by triple-clicking/tapping. Switch between tabs by "tip-tapping" (holding down one or more fingers and tapping just one finger on the left or right side.) This powerful utility is completely customisable, so these are just ideas for how you can take control of your mac from your trackpad. The app also includes window snapping (not quite as powerful in this department as some other examples on this list) and using the companion BTTRemote, you can control your computer from your phone.