ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Feedbutler - Subscribe to your RSS feeds directly via email!
RSS API - Convert & subscribe to RSS, ATOM and JSON-Feeds via API ⚡️ Get webhooks whenever there is a new entry in a Feed.
follow.it - follow.it gets publishers more followers & recurring traffic, and provides a better reading experience for followers
FeedBlitz - FeedBlitz is a mega pack solution for social media marketing and RSS feed and subscriber integration.
Feedly - The content you need to accelerate your research, marketing, and sales.