The Photographer's Ephemeris - TPE is a tool to help you plan outdoor photography in natural light, especially landscape and urban scenes. It is a map-centric sun, moon and milky way calculator: see how the light will fall on the land, day or night, for any location on earth.
Solaris Sky Calendar - An astronomy calendar right in your pocket
SunIZup - SunIZup helps you to know the timings of the various Sunlight phases including the Golden Hour and...
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
Alpenglow - Never miss a incredible looking sunrise or sunset again