The Sun Java System Directory Server was Sun Microsystems' LDAPdirectory server and DSML server written in C. The Java System Directory Server is a component of the Java Enterprise System. Earlier iterations of Sun Java System Directory Server were known as Sun ONE Directory Server, iPlanet Directory Server, and, before that, Netscape Directory Server.
The software was available free of charge for perpetual usage in individual, commercial, service provider, or research and instructional environments. It is still available for download at the Oracle website, the new official site for Sun products; however only the latest version (DSEE 7, rebranded as ODSEE 184.108.40.206.0) can be found in this site.
Sun started developing OpenDS in Java in 2011, due to too many issues with developing Sun Java System Directory Server with the C language. The code base has not been updated since 2011.