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Dig around in this space for more detailed info on current state of requirements, gap analysis, and more about the OSIdM4HE activity.
There was an interest in an ongoing snapshot of fit and maturity of the various open source options within the IdM ecosystem. Slide 9 in this pdf provides some information along these lines:
https://wiki.jasig.org/download/attachments/43417745/april_2011_cas_community_call_slides.pdf