Feed2Mail - Feed2Mail notifies you when your favorite feeds and websites are updated.
Free Twitter RSS Feed Generator - Convert Twitter lists, hashtags & searches into RSS feeds
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
RSS API - Convert & subscribe to RSS, ATOM and JSON-Feeds via API ⚡️ Get webhooks whenever there is a new entry in a Feed.
Feedbutler - Subscribe to your RSS feeds directly via email!
RSS3 - RSS with human curation