LDAP Directory Servers and LDAP Browsers
Apache
http://directory.apache.org/
http://directory.apache.org/apacheds/1.0/11-what-apache-directory-server-is.html
http://directory.apache.org/apacheds/1.0/apacheds-v10-basic-users-guide.html
http://directory.apache.org/community%26resources/articles.html
Other
http://www-unix.mcs.anl.gov/~gawor/ldap/features.html
http://ldap.akbkhome.com/index.php
http://www.jxplorer.org/