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OpenLDAP - http://www.openldap.org/
OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol. |
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Novell eDirectory - http://www.novell.com/products/edirectory/
Novell eDirectory is a Lightweight Directory Access Protocol (LDAP)-enabled, directory-based identity management system that centralizes the management of user identities, access privileges and other network resources. |
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IBM Tivoli Directory Server - http://www-306.ibm.com/software/tivoli/products/directory-server/
Commercial LDAP server. Includes overview and technical information. |
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Symlabs - http://symlabs.com/
Offer virtual directory (featuring LDAP support), identity management and single sign-on solutions. |
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Oracle Internet Directory - http://www.oracle.com/technology/products/oid/
A standards-based LDAP directory which leverages the scalability, high availability and security features of an Oracle database. |