BetterTouchTool adds over 60 new customisable multitouch gestures to your Mac, plus global keyboard shortcut management, Windows 7-like window snapping and more.
We've mentioned BetterTouchTool before, but as reader SarcasmSiempre notes, it's come a long way in the past few years. BetterTouchTool's main purpose is to give you more control over the trackpad and Magic Mouse gestures on your Mac. Not only can you customise the ones you already have, but it ads a ton of new gesture possibilities, like different kinds of single and multiple-fingered taps, swipes of all shapes and sizes and support for up to 11(!) fingers. There are literally over 60 different gestures to which you can assign actions.
However, BetterTouchTool is also now a global keyboard shortcut manager, letting you remap hotkeys, assign them to built-in menu options, or assign them to BetterTouchTool functions. You can even remap the keys on your Apple Remote. And, lastly, BetterTouchTool also brings Windows 7-like window snapping and switching to OS X. It isn't the only program that does so, but if you're already using it for gestures, it's nice to be able to get that functionality without another app in your menu bar. If you haven't checked it out in a while, I highly recommend giving it another look -- especially if you're upset with the way OS X Lion changed all the multitouch gestures you were used to.
BetterTouchTool is (shockingly) a completely free app for OS X.