Dragon Responsive Email Designer - Dragon Email Designer provides an intuitive drag and drop newsletter design tool.
MailDeveloper - Advanced editor for responsive HTML emails
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
EDM Designer - Make Responsive Email Templates. No Code.