FeedReader is a RSS feed reader for GNU/Linux desktops though it looks more like something made for a phone or a tablet.
Features and overview
FeedReader lets you subscribe to feeds and organize them into folders but not sub-folders. You also can't pick a folder from a list when adding a feed, you have to write it into a box each time.
FeedReader is, quite frankly, overall a bit of a pain to use. It also lacks some of the basic features other feed readers such as QuiteRSS and Liferea has. It is also one the only RSS reader which feels a bit "sluggish" to use; it's not instantly responsive on modern hardware.
Overall, it's not something we can recommend.
See our RSS feed reader comparison for better alternatives.