Dragon Responsive Email Designer - Dragon Email Designer provides an intuitive drag and drop newsletter design tool.
MailDrop - maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.
Marble Responsive Email Designer - Marble helps you design beautiful and mobile-friendly emails and newsletters.
InboxKitten - An open-source, disposable email service π
Kingmailer - Kingmailer helps you send, receive and route/forward emails.
Unroll.me - A cleaner inbox is just a click away! Unroll.Me gives you the tools you need to manage a cluttered mailbox full of pesky subscriptions emails.