Wikipedia
OpenDJ
OpenDJ is an open source Lightweight Directory Access Protocol (LDAPv3) and Directory Service Markup Language (DSMLv2) compliant directory service written in the Java programming language. OpenDJ began as a fork of the OpenDS code base and is now the main trunk developed and maintained by ForgeRock, which originated in 2005 as an internal project at Sun Microsystems started by Neil A. Wilson, and later grew into an open source project, maintained by Oracle Corporation following Oracle's acquisition of Sun. OpenDJ source code is available under the Common Development and Distribution License (CDDL).