Bitcard

Link: www.bitcard.org.

Bitcard is an open single-sign-on web-authentication service. It's free for both users and web sites. It is used by most perl.org services.

Ask created a yet-another single sign-on service Bitcard. It looks very nice since it's freely available for users and websites like our TypeKey, and it supports TypeKey API as well. I wanna see an OpenID support on it.