Kill the Newsletter! - Convert newsletters into RSS feeds
Free Twitter RSS Feed Generator - Convert Twitter lists, hashtags & searches into RSS feeds
sumi.news - Peaceful news feed to read RSS, Twitter, and newsletters
RSS API - Convert & subscribe to RSS, ATOM and JSON-Feeds via API ⚡️ Get webhooks whenever there is a new entry in a Feed.
RevSync.io - Convert your Twitter followers to newsletter subscribers
RSS3 - RSS with human curation