UpLib is a universal personal digital library system. The system consists of a full-text indexed repository accessed through an active agent via a Web interface. It is "universal" in the sense that documents are canonically represented as projections into the text and image domains, and uses a predominantly visual user interface based on page images. UpLib can thus handle any document format which can be rendered as pages.
Uplib is now Open Source under a GPL license! Get it here.