LogicSpice Business Directory Listing Script - PHP Business Directory Listing Script - Yellow Pages Clone Script
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
phpListings.com - Start your own business directory website with customizable widget-based templates and effective listing monetization tools.
Zentyal - Linux directory, domain, mail, gateway and infrastructure server for SMBs.
Brilliant Directories - Brilliant Directories offers member management solution to streamline all aspects of membership website or association.
OpenLDAP - OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.