Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.