NewsBlur is my browser's home page. I was a refugee from Google Reader years ago. It supports many of the former's features, is open source, and a SaaS pro if you don't want to deal with self hosting.

But man, that's just a handful of it's features.

And it has a social feature, "blurblogs" on which you share articles. It's quite great, just signed up :)

And it's open source!

Thanks for the tip frumiousirc!