Topol.io - Create professional Email templates easily - Drag & Drop Email Builder.
Mailu - Mailu is a simple yet full-featured mail server as a set of Docker images.
BeeFree.io - Bee is MailUp's drag-&-drop editor for responsive design emails.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
MJML - The open source framework for responsive emails
MailEnable - MailEnable is a Windows based mail server and email server program that is packed with the state of the features and functions like antivirus and spam filtering system, webmail management system, cardDAV, CalDAV and much more.