YMLP - YMLP is an easy-to-use email newsletter software to manage, send & track your email newsletter.
MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!
Revue - The easiest way to create and send a curated newsletter
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Publicate - Build Beautiful Emails. Export and Send Anywhere.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.