Mailtrain - Self-hosted open-source Mailchimp clone
Cappuccino - Cappuccino is a framework which makes it easy to create advanced web apps.
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
Free Twitter RSS Feed Generator - Convert Twitter lists, hashtags & searches into RSS feeds
Kill the Newsletter! - Convert newsletters into RSS feeds
RSSMailer - Get your RSS feeds in your inbox 💌