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Rack provides a common API for connecting web frameworks, web servers and layers of software inbetween. Official repos: http://github.com/rack/rack
A JSON Web App Framework designed to provide for simple applications dealing solely with JSON requests and responses from AJAX client applications or for lightweight server-side message transport.
A small scale authentication server to provide multiple applications one point of contact for authentication against LDAP et al data stores. The system will respond with a temporary Authenticated Token to be used for the session. There will also be a client-side library for use in Ruby available.