Mailtrain - Self-hosted open-source Mailchimp clone
Kill the Newsletter! - Convert newsletters into RSS feeds
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Revue - The easiest way to create and send a curated newsletter
RSS API - Convert & subscribe to RSS, ATOM and JSON-Feeds via API ⚡️ Get webhooks whenever there is a new entry in a Feed.
MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!