The ABCs of LDAP: How to Install, Run, and Administer LDAP Services

http://www.ldapadministrator.com: Commercial LDAP administration tool.

http://phpldapadmin.sourceforge.net: LDAP administration tool in PHP.

http://www.iit.edu/~gawojar/ldap: LDAP browser written in Java.

http://www.huff.ca/doc/web2ldap/web2ldap.html: LDAP administration tool in Python.

http://biot.com/gq: LDAP administration tool written in C.

http://www.mjwilcox.com/plums: LDAP administration toolkit in Java.

http://developer.netscape.com/docs/manuals/communicator/ldap45.htm: Configuring the Netscape Communicator as LDAP client.