389 Directory Server - Powerful OpenSource LDAP

The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. OpenLDAP and Fedora Directory Server were both derived from the original University of Michigan slapd project. In 1996 the original developers of slapd became Netscape employees and developed Netscape Directory Server, which is now Fedora Directory Server. Its features include:

• 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
• Extensive documentation including helpful Installation and Deployment guides
• 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