Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Mailtrain - Self-hosted open-source Mailchimp clone
Revue - The easiest way to create and send a curated newsletter
IMAP API - Self hosted and lightweight daemon application
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
phpList - phpList is an email and newsletter marketing tool.