Piggydb is an open source Web notebook application that provides you with a platform to build your knowledge personally or collaboratively. Developed by Daisuke Morita
License: Open Source
Zim is a desktop-based personal wiki application focused on offline note-taking with a simple interface, while Piggydb is an open-source knowledge management tool that supports data visualization and collaboration but may be more complex for some users. Users seeking robust offline capabilities and version control may prefer Zim, while those looking for a customizable and collaborative platform might choose Piggydb.