GANYMEDE is a portable and customizable network directory management system.
http://www.arlut.utexas.edu/gash2/
Instructions for doing authentication with LDAP
http://www.openldap.org/lists/openldap-software/200010/msg00097.html
Samba-PDC LDAP
http://www.unav.es/cti/ldap-smb/ldap-smb-2_2-howto.html
System Authentication using LDAP
http://staff.pisoftware.com/bmarshal/publications/ldap.html
Getting Red Hat Linux 6.1 to authenticate via LDAP (openldap in particular)
http://people.redhat.com/alikins/ldap/ldap.html
Red Hat Linux 7.2: The Official Red Hat Linux Reference Guide (LDAP)
http://www.redhat.com/docs/manuals/linux/RHL-7.2-Manual/ref-guide/ch-ldap.html