WHMCS is the complete all-in-one client management, billing and support solution for Web sites and other online businesses. The package of features, but the primary focus on remaining easy to use and configure, WHMCS allows you to easily and effectively manage their business. It also allows you to automate many routine tasks including invoicing, order [...]
KnowledgeTree is an enterprise-level open source document management application built with PHP & uses MySQL for storing the data. It enables reaching documents via web, desktop or Microsoft Office applications (via an add-in) & sharing them become easier with integrated dicussion forums, e-mailing, tagging & more.