When comparing TagSpaces 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 TagSpaces is ranked 46th. 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 Open source
TagSpaces is free and open source making it easily extendable with the help of extensions.
Pro Your can choose your cloud file storage
Using only files and no databases let's you make the decision with which cloud file sync service to use, making sure your notes are made available on other devices and platforms. It works great with Owncloud, Nextcloud, Dropbox or Google Drive.
Pro No web service or database lock in
The backend is simply the directory and file structure on your harddrive.
Pro No cloud
TagSpaces is running completely offline, sending no data to any cloud based service, unlike many Evernote alternatives.
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.
Pro Lightweight
Cons
Con It renames your files in order to tag them
The positive side of this drawback is that this way the tags are easily transferred to other platforms by simply syncing them.