Piggydb is a Web application for building personal knowledge base systems. You can write your knowledge in the same manner as blogging. Piggydb enables you to create highly structural knowledge by providing the features such as hierarchical tagging and flexible relationships between knowledge fragments. It encourages you to organize your knowledge continuously to discover new ideas or concepts, and moreover enrich your knowledge. License: The Apache License 2.0 Changes:
This is a minor update, but it contains an important feature of tag manipulation. The new feature enables you to select tags from the tag tree and manipulate them in various ways. It provides a very intuitive way for creating knowledge with tags. This update also contains some usability changes.