Brewtarget

target is an interesting application designed to help you create and manage different recipes for beer. You can use various predefined recipes, such as Bavarian, American Pilsner, or Red Hook; or you can create your own recipes from scratch. Whatever you choose, you can add different amounts of yeast, hops, barley, and style to create a unique blend of flavors. Depending on how much you add of each of these variables, the application will tell you what kind of flavor you'd get, giving you a good reference to work from. Brewtarget is a very unusual application that might not be useful for everyone, but any true beer enthusiast should give it a try.