I love the Mixology app. Not only can you find the recipes for almost 8000 drinks, you can avoid a trip to the liquor store by entering the ingredients you DO have in your liquor cabinet, and letting Mixology tell you all the drinks you can make with what you already have! Genius. Lots of other features such as sharing recipes with friends on social media, bartender tips & tricks, and a random recipe generator make it both useful and fun. Grab it for your iPhone, Android, or Windows device.