After the closure of Google Reader – which I was a big fan of – I moved all of my RSS feeds to NewsBlur. One of the reasons I moved to NewsBlur is that it has a full API and is very easy to interface with!
For instance, folder feeds are available and don’t require authentication, making it easy for an app to merge multiple RSS feeds and treat them as one. For example: in NewsBlur, I’ve created a folder called economy and set up multiple feeds (New York Times, Forbes, Washington Post Business) underneath that folder, like so:
Right clicking the folder name and clicking folder settings pops up the folder settings tab. The URLs listed in the Feed Address section return a RSS list with all of the items from the feeds combined into a single feed. Even better: the URL supplied doesn’t require authentication, so an application can read it instead of having to poll 5 separate RSS feeds.