Freely-available solution for managing content on Web, Extranet, and Intranet services. LGPL

freshmeat.net: "Midgard is a toolkit for building dynamic applications to power eBusiness and Information Management processes. Writing applications and functionalities for the platform is done using the easy-to-learn PHP scripting language. All interfacing with the system is done via a regular Web browser, and no special tools are needed for developers or content authors."