There are many; VSCO and camera+ for example. Even in the default camera app you can point at something white, like white paper lit with white light, and long-

There are many; VSCO and camera+ for example. Even in the default camera app you can point at something white, like white paper lit with white light, and long-press to get an auto focus and auto exposure lock. Then you can get a picture of the orange sky / landscape and it will use the locked white balance setting.