Wikipedia
Planz
Planz is an open source personal information manager developed by the Keeping Found Things Found group at the University of Washington Information School. It integrates e-mail, website links and content, computer files and folders, and informal notes into a simplified, document-like interface. Its purpose is to make the user's personal information easily accessible for use in planning everyday activities as well as larger projects. Planz is a research prototype rather than a commercial product.