Paul writes: "The University of Minnesota Libraries Digital Library Development Lab has been working for three years on a library-centric authoring tool for building subject pathfinders, authoring course-related web pages, and general all-purpose pages. The project was written (simply and well-documented) around linux/apache/mySQL/PHP. It's about 34,000 lines of code and utilizes 40 underlying tables. It's being presented this week at the annual Digital Library Federation conference in New Mexico. See the site [1] for (GPL) license details, documentation, and download."
Links:
[1] http://plato.lib.umn.edu