When comparing Piggydb vs Tomboy, the Slant community recommends Tomboy for most people. In the question“What is the best cross-platform note-taking app?” Tomboy is ranked 14th while Piggydb is ranked 58th. The most important reason people chose Tomboy is:
All the components are free, opensource, and allows self-hosting the sync server.
Specs
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Pros
Pro Creativity
Piggydb is a knowledge building application. You can think of it as a mix of notetaking, outliner and concept map all together, but with the flexibility to do more than that. Its non-linear system and bottom-up or heuristic approach gives you the possibility of creativity to discover new concepts and ideas based on your input. There is no wrong way of using Piggydb. It helps you to elaborate your own knowledge.
Pro Free
Pro Hierarchical tags
Hierarchy for tags gives more flexibility than folders for classifying and structuring your content. It even allows to have parallel hierarchies for the same content using the same tags, connecting your notes together, but in different order. It is up to your needs and creativity.
Pro Free and open source
All the components are free, opensource, and allows self-hosting the sync server.
Pro Can be extended with add-ins
If Tomboy doesn't have the features you want out of the box, you may be able to find them here as a plug in.