Nexor Directory
- High Performance X.500/LDAP directory server build on top of an OO database and a WWW based management interface.
- http://www.nexor.com/index.php?option=com_content&task=view&id=164&Itemid=216

NIS/LDAP Gateway
- Gateway software for integrating LDAP in an NIS infrastructure
- http://www.padl.com/Products/NISLDAPGateway.html

PWGSC DSML to LDAP Gateway
- A Perl-based DSML/LDAP Gateway that uses DSML v.2 and SOAP (SOAP:Lite) as transport mechanism.
- http://fdis.srv.gc.ca/dsml/dsml_e.htm

RadiantOne Virtual Directory Server
- RadiantOne is a flexible and comprehensive identity infrastructure designed to integrate identities and match them to application requirements. By virtualizing the directory service, identity infrastructure doesn't have to be one-size-fits all.
- http://www.radiantlogic.com/main/products_vds.html

Symlabs
- Offer virtual directory (featuring LDAP support), identity management and single sign-on solutions.
- http://www.symlabs.com/

Novell 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.
- http://www.novell.com/products/edirectory/

OpenLDAP
- OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
- http://www.openldap.org/

Sun Java System Directory Server Enterprise Edition
- High-performance, highly scalable directory for enterprise and carrier-grade environments.
- http://www.sun.com/software/products/directory_srvr_ee/

Isode M-Vault
- A high performance LDAP Directory Server, including replication, high functionality access control and security management, graphical administration tools, and Web access.
- http://www.isode.com/products/m-vault.html

IBM Tivoli Directory Server
- Commercial LDAP server. Includes overview and technical information.
- http://www-306.ibm.com/software/tivoli/products/directory-server/

Oracle Internet Directory
- A standards-based LDAP directory which leverages the scalability, high availability and security features of an Oracle database.
- http://www.oracle.com/technology/products/oid/