Downloading Mac3Tag 1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X is a product of Igor Rudman. The program is included in Audio & Video Tools. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Mac3Tag helps to edit the tag-information of the MP3 files. Therefore, the application enables you to quickly and easily change the genre, the title of the tracks, and the artist and album names of multiple MP3 files. This small program runs under almost every operating system, including Mac OS.
You may want to check out more Mac applications, such as VCode, MFilter or Aiseesoft WMV Converter for Mac, which might be related to Mac3Tag.