Constant Contact vs Mailtrain: What are the differences?
Constant Contact: Grow with Email Marketing. Guaranteed. As an industry leader in permission based online marketing, Constant Contact partners with the leading providers of online marketing and social media marketing solutions; Mailtrain: Self-hosted open-source Mailchimp clone. Mailtrain is a self hosted newsletter application built on Node.js (v5+) and MySQL (v5.5+ or MariaDB).
Constant Contact and Mailtrain can be primarily classified as "Email Marketing" tools.
Mailtrain is an open source tool with 4K GitHub stars and 435 GitHub forks. Here's a link to Mailtrain's open source repository on GitHub.