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.
Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
SunIZup - SunIZup helps you to know the timings of the various Sunlight phases including the Golden Hour and...
SunCalc - Find out where the sun will be at any time in any location
Sol: Sun Clock - Get reminded when it's sunrise or sunset, wherever you travel!
Solar Clock: Circadian Rhythm - Solar Clock: Circadian Rhythm syncs the Solar time with your Local time and shows important events (Sunrise, Waking up, Breakfast, Lunch, Solar Noon, Sport, Sunset, Sleep Time, …) based on Circadian rhythm.