An open source project originally designed to provide the University of Michigan with a secure single sign-on web authentication system. Cosign is part of the National Science Foundation Middleware Initiative (NMI) EDIT software release.
Follow Cosign: Web Single Sign-On
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Very good Software.
We use this in a shared host environment where each customer have different users. Even if cosign is not designed for this, we still managed to tweak it into satisfying our use case.