Piggydb
Piggydb is a Web notebook application that provides you with a platform to build your knowledge personally or collaboratively. With Piggydb, you can create highly structured content by connecting knowledge fragments to each other to build a network structure, which is more flexible and expressive than a tree structure. Fragments can also be classified using hierarchical tags. Piggydb does not aim to be an input-and-search database application. It aims to be a platform that encourages you to organize your knowledge continuously to discover new ideas or concepts, and moreover enrich your creativity. "Piggydb is designed to maximize your creativity and help you connect the dots between your ideas. More flexible than a standard database and easier to use than a Wiki, Piggydb gives users the help they need to create truly comprehensive knowledge listings around a particular topic. The personal version is completely self-contained and does not require any kind of web server software. Its as simple as downloading and installing the software and launching the server. Your default browser will automatically load the Piggydb system." - fiberdownload.com
