What is current state of the art for enabling OpenID login in Ruby on Rails applications? This is a community wiki with up-to-date answers to this question.
Authlogic
The most advanced authentication solution seems to be Authlogic. It supports OpenID with Authlogic OpenID plugin. It supports Rails 4 and 3. Rails 2 is supported in the rails2 branch.
You may want to watch "OpenID with Authlogic" railscast (and the "Authlogic" railscast).
There is a sample application called Authlogic OpenID Selector Example.
Devise
Devise is flexible authentication framework for Rails. It supports OpenID with devise_openid_authenticatable.
restful_authentication
Another authentication library of choice is restful_authentication Rails plugin. Seems like you also need to install open_id_authentication plugin.
You may want to watch (old, circa 2007) "OpenID Authentication" railscast.
Ruby OpenID
Raw support for OpenID protocol is handled by Ruby OpenID library.
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