Mailtrain - Self-hosted open-source Mailchimp clone
HTMLEmail.io - Responsive HTML email templates for startups & developers
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Startup Emails - Responsive HTML email templates for startups
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Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.