If you want to use OpenID for authentication or OAuth for authorization/authentication in your Ruby web applications, there are a number of different options out there. Here are a few screencasts demonstrating some of the Rack-based solutions for anyone interested in easily integrating OpenID and/or OAuth into their web applications: Rack::OpenID, Rack::OAuth, Rack::OpenID::Proxy (useful if you need a proxy OpenID consumer)… And links to the original projects: ruby-openid, oauth, Rack::OpenID, Rack::OAuth, Rack::OpenID::Proxy