JanRain's myOpenID is popular OpenID provider, supports SSL, SREG, some persona, authentication with Information Card, OpenID Attributes Exchange (but only some attributes), Pavatar and so on. JanRain also offers ruby-openid that implements OpenID 2.0 with Ruby. myOpenID supports only some attributes that can be exchange with OpenID Attribute Exchange, but you should care about Type URI, because m
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