You could have downloaded Multi-Item Edit 4.8 for Mac from our application library for free. Multi-Item Edit for Mac is included in System Tools. This Mac application was originally produced by Doug Adams.
From the developer:
This applet will allow you to edit most tags (and some additional options) of the selected track(s) in a single floating window using single-edit mode (one selected track) or multi-edit mode, which emulates the pre-iTunes 12 "multiple items" format; that is, a checkbox adjacent to each tag allows you to select which changes are to be applied to the selection's tags.
You may want to check out more software for Mac, such as MovieMator Free Mac Video Editor, Tex-Edit Plus or Plain Text Editor, which might be similar to Multi-Item Edit.
Document management
Document management