Sendy is a self hosted email newsletter application that lets you send trackable emails via Amazon Simple Email Service (SES). This makes it possible for you to send authenticated bulk emails at an insanely low price without sacrificing deliverability.

MailChimp helps you design email newsletters, share them on social networks, integrate with services you already use, and track your results. It's like your own personal publishing platform.

As an industry leader in permission based online marketing, Constant Contact partners with the leading providers of online marketing and social media marketing solutions.

It is an open marketing software platform that provides you with the greatest level of integration and deep audience intelligence, enabling you to make more meaningful customer connections. It Connects all your digital properties & channels into a seamless customer experience.

Mailtrain is a self hosted newsletter application built on Node.js (v5+) and MySQL (v5.5+ or MariaDB).