Standing for "If This Then That", IFTTT is a handy little iOS app that allows you to program your phone's other apps to work in conjuction with one another, without your help. By programming a list of commands into IFTTT, you can create a list of simple, but effective, automated hacks that let your iPhone do all the work that you're either too busy or too forgetful to do on your own. For instance, you could have a weather app work with iMessage to text you a weather forecast each morning, or let have Etsy email you notifications when new items are listed for sale; the number of possibilities is truly endless. Download it today in the App Store.