When comparing Nimbus Notes vs TagSpaces, the Slant community recommends TagSpaces for most people. In the question“What is the best cross-platform note-taking app?” TagSpaces is ranked 46th while Nimbus Notes is ranked 64th. The most important reason people chose TagSpaces is:
TagSpaces is free and open source making it easily extendable with the help of extensions.
Specs
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Pros
Pro Easy categorization
An Evernote alternative where categorization is quite easy, as Nimbus Notes uses both a hierarchical folder structure and hashtags (#).
Pro Very easy migration tool for transferring from Evernote
There's a tool for Windows which lets users transfer their notes from Evernote to Nimbus. Here's a guide on how to do it.
Pro Feature-rich
Pro Free for private use
Does not restrict you to only two devices like Evernote does for its free version.
Pro Similar to Evernote but without the bugs
Pro Very good help desk
Excellent help desk advice and interaction when trying to find a solution to the data issue mentioned previously.
Pro Excellent Android, iOS and Windows apps
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.
Cons
Con No Linux version
Con Limited styling functions
There are limited ways to style/edit your notes (no font colors or sizes for example).
Con The interface is not as elegant as Evernote
The UI has a fairly outdated appearance, which isn't as smooth or intuitive to use as Evernote.
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.