For Ruby there's Devise (email/pass based user management) and Omniauth (facebook, twitter, etc). Omniauth can also be used on top of Devise. There are others t

For Ruby there's Devise (email/pass based user management) and Omniauth (facebook, twitter, etc). Omniauth can also be used on top of Devise. There are others too, but I mention these two because they are popular and sufficient for most people. - https://github.com/plataformatec/devise https://github.com/plataformatec/devise and https://github.com/intridea/omniauth https://github.com/intridea/omniauth For Django, there is Pinax Project - http://pinaxproject.com/ http://pinaxproject.com/