Alpenglow - Never miss a incredible looking sunrise or sunset again
Lumy - Helps you track photographic times
SunCalc - Find out where the sun will be at any time in any location
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.
GoldenHour.One - Your personal assistant for outdoor photography for iOS
Natural Hour - A roman timekeeping add-on for Suntimes.