Google Calendar - Spend less time managing your day & more time enjoying it
Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.
SunCalc - Find out where the sun will be at any time in any location
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
SSuite My Calendar Diary - A portable calendar and diary for people on the move...
Alpenglow - Never miss a incredible looking sunrise or sunset again