Yup. That's the source code (under AGPL). It is also hooked to appharbor infrastructure so that whenever I sync with GitHub, it got automatically deployed to the server. The neat thing is this, anybody can sign up to appharbor for free (I am not associated in anyway with them), hook the source code to the GitHub source and got the app up and running.
I am working on a feature to manage an OPML RSS subscription list. Then I'll construct a draft version of a News Aggregator that consume the OPML file then it will spit out river.js format. Than voilla, any Tabbed River can read them.