[acdha]

I find Newsblur.com has passed Reader in almost every way – feed management, social, etc. – and it has a viable business model, not to mention being open-source (https://github.com/samuelclay/NewsBlur).

The one advantage Reader arguably still had was what came from their search infrastructure (caching nearly everything forever & near-realtime updates) but that's not something I notice very often.