Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.

SunIZup - SunIZup helps you to know the timings of the various Sunlight phases including the Golden Hour and...

Zoho Calendar - Zoho Calendar is a business calendar that comes along with the Zoho Mail suite of applications. Make your schedules click by effortlessly managing events with Zoho Calendar.

SunCalc - Find out where the sun will be at any time in any location

Calbird - Simple, instant scheduling.

Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.