From Authentication Tools for Joomla! (JAuthTools)
JAuthManager 1.5 provides a single point interface for accessing SSO plugins and any service providers they might offer, identity provider plugins, authentication and user plugins.
JAuthManager is a system designed to provide a base UI in Joomla! 1.5 for administering tasks such as group membership mappings and the configuration of JAuthTools related plugins (e.g. SSO and User Source plugins).
A secondary aim is to provide diagnostic tools so that administrators can determine problems with their setup.