Solaris Sky Calendar - An astronomy calendar right in your pocket
Priime - Edit photos with the styles of the world's top photographers. Smart suggestions, fast editing, and inspiring collections.
Lumy - Helps you track photographic times
Nizo - A better iPhone camera for shooting film
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
VSCO Cam - VSCO Cam is an iPhone, iPod Touch, & Android camera app w/ elegant, minimal processing options.