[samingrassia]

You should also checkout Drywall (http://jedireza.github.io/drywall/)

Has all major oauth integrations and a fantastic user system... I have also heard that it was used a bunch at node knockout recently. Definitely worth checking out-

[ChrisBland]

I've used Drywall - it makes standing up a service nice, however I dislike their backbone on every page vs single page app. I wish they would have done that diff, but its easy to use the existing API for things like resetting passwords and sending emails.

[czbond]

Another vote on Drywall as well. I do agree though with your backbone vs single page comment. That bugged me - but can't complain.