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What are your recommendations for a basic, centralized identity management/SSO service? It must be open source, have a pluggable identity manager (eg: LDAP, DB, openID, etc.) and provide a decent range of API access options (eg: web services, REST, etc.). It must also be clusterable for high availability.
JOSSO? CAS? others?
Dont forguet simpleSAMLphp if you looking for SAML support or HybridAuth if you just looking for a SSO library.
There are a number of open source SSO solutions, OpenAM/OpenSSO, CAS Server and Shibboleth.
WSO2 as described here. It's absolutely free, Java based and integrates with most of services / apps via various protocols or APIs.