Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

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

Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

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

eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.

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