Blux Camera Free (iOS)
This camera app gives you an ease-of-use alien to other apps of this ilk. So you can adjust the colour warmth right there on the screen even as you compose the frame. Zoom can be adjusted with the right hand. There is a PEAR feature that uses the location data to tell you where you are and the weather for the place. Then you have the more detailed camera settings and tweaks which can also open on to the screen from the right. Along with being a very useful camera app, this also gives an insight into how user interfaces of apps can be a USP in itself.