OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.
LogicSpice Business Directory Listing Script - PHP Business Directory Listing Script - Yellow Pages Clone Script
FreeIPA - FreeIPA is an integrated security information management solution combining Linux (Fedora), 389...
Brilliant Directories - Brilliant Directories offers member management solution to streamline all aspects of membership website or association.
389 Directory Server - Enterprise-class open source Linux LDAP server.
LepideAuditor for Active Directory - LepideAuditor for Active Directory is said to be the must-have part of the IT environment and IT administration purpose.