I'm also working on an open source RSS Reader called HappyFeed. It's compatible with Fever RSS API, so you can use it with Reeder, ReadKit, Press and so on.
I work on this project mainly for myself, but if you're interested and want to contribute, feel free to get in touch!
Screenshots and development blog: https://need.computer/happyfeed/2015/12/20/happyfeed-drag-an...