JSON Feed is a new syndication format that uses JSON instead of XML to store its data. JSON is generally considered easier to read and write than XML, making for less error-prone data structuring and broken feeds.

This won't disappear in a year or two if ad revenue falls off.

Licensed under MIT. Code available on GitHub.

The web interface is nice, and the apps give a great native experience regardless of what platform you're on.

Works with Reeder, ReadKit, Mr Reader, SubToMe and many, many other apps.

Uncluttered and intuitive to use.

Feedbin has a fully-featured, free, REST-style API.