Mailtrain - Self-hosted open-source Mailchimp clone
Free Twitter RSS Feed Generator - Convert Twitter lists, hashtags & searches into RSS feeds
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
RSS API - Convert & subscribe to RSS, ATOM and JSON-Feeds via API ⚡️ Get webhooks whenever there is a new entry in a Feed.
Kill the Newsletter! - Convert newsletters into RSS feeds
Feedbutler - Subscribe to your RSS feeds directly via email!