Kid3 3.9.4 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is Urs Fleisch.
We recommend checking the downloaded files with any free antivirus. Kid3-3.0.1-darwin.dmg or kid3-2.1.0-darwin.dmg are the common file names to indicate this application's installer. The program lies within System Tools, more precisely General. The most popular versions of the tool are 3.1, 3.0 and 2.1.
From the developer:
Kid3 is a batch ID3 tag editor. Edit tags Generate tags from filenames Generate filenames from tags Rename and create directories from tags Generate playlist files Export tags as .CSV, .HTML, playlists, Kover .XML, and other formats
You may want to check out more Mac applications, such as SheepShaver, SMART Utility or SizeUp, which might be related to Kid3.