Useful iPhone apps for analogue film photography

Lately I am shooting analogue almost exclusively, trying to get unplugged. But since my old trusty iPhone 4s (IOS 8.1) is always with me I decided to try several apps to see if they can be useful for a film photography.

I completely dismissed image manipulating / organizing apps and focused only on those that, supposedly, can help with shooting film. After spending $ and time I have to say that majority of apps are just waste. But not all.
So here is my pick listed in order of typical photo workflow.