Ruby OpenID makes it easy to add OpenID authentication to your web applications. This library is a port of the Python OpenID library, and features:

* API for verifying OpenID identities (OpenID::Consumer) * API for serving OpenID identities (OpenID::Server) * Consumer and server support for extensions, including simple registration * Yadis 1.0 and OpenID 1.0 service discovery, including server fallback * Does not depend on underlying web framework * Multiple storage implementations (Filesystem, SQL) * Comprehensive test suite * Example code to help you get started, including: - WEBrick based consumer - Ruby on rails based server - OpenIDLoginGenerator for quickly creating a rails app that uses OpenID for authentication - ActiveRecord adapter for using an SQL store in rails