An LDAP-based server that centralizes application settings, user profiles, group data, platform independent, system. Forming the central repository for an Identity Management infrastructure, as a directory server simplifies user management, eliminating data redundancy and automating data maintenance. It also improves security, by storing policies and access control information, Red Hat/389 Directory Server creates a single authentication source across entire enterprise for both intranet and extra net applications.
http://directory.fedoraproject.org/
Features
  • Multi-Master Replication, to provide fault tolerance and high write performance
  • Scalability: thousands of operations per second, tens of thousands of concurrent users, tens of millions of entries, hundreds of gigabytes of data.
  • The codebase has been developed and deployed continuously by the same team for more than a decade.
  • Active Directory user and group synchronization
  • Secure authentication and transport (SSLv3, TLSv1, and SASL)
  • Support for LDAPv3
  • On-line, zero downtime, LDAP-based update of schema, configuration, management and in-tree Access Control Information (ACIs)
  • Graphical console for all facets of user, group, and server management
  • Extensive documentation, including helpful Installation and Deployment guides
For detail feature list http://directory.fedoraproject.org/wiki/Features
http://www.redhat.com/f/pdf/rhas/DirSecProductSheetDirectoryServer.pdf