Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
aerc - Highly efficient and extensible email client for the terminal
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Netlify - Build, deploy and host your static site or app with a drag and drop interface and automatic delpoys from GitHub or Bitbucket
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.