OpenDJ comprises of an open source directory server, client tools, and an LDAP SDK. All modules are 100% Java based and require Java 1.6.
OpenDJ is a downstream build of the OpenDS project, with a different name to avoid trademark issues.
OpenDJ is a new LDAPv3 compliant directory service, developed for the Java platform, providing a high performance, highly available and secure store for the identities managed by your enterprise. Its easy installation takes OpenDJ the simplest and fastest directory server to deploy and manage.
At minimum, you need Java 6. If you have Java WebStart configured, you can install OpenDJ server starting with a single click in your web browser. For hardware, you can do an evaluation install on a netbook by default using 256 MB free RAM and less than 100 MB free disk space. How much hardware you need for deployment depends on your requirements.
You can freely download, evaluate, deploy, even build your own version of OpenDJ software. The license is CDDL.
Download the latest stable version from the download page. You can also get the latest nightly build there. If you want to roll your own, check out the Guide to OpenDJ Subversion.
Sign up for the OpenDJ mailing list. Join the project. Visit the OpenDJ Wiki documentation. Chat on irc.freenode.net #opendj.
OpenDJ is actively developed, see the bug database activity. Also see the OpenDJ Roadmap.
Come discuss your work on the dev mailing list. Join the project, too.
Start with the QA documentation. Join the project. Come discuss your work on the dev mailing list.