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

Google Calendar - Spend less time managing your day & more time enjoying it

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

Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.

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.

Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.