I don't offer a native version of Mp3tag for macOS or Linux, but you can choose from the following options to run Mp3tag under macOS and Linux.
Mp3tag on macOS
Under macOS you can use the Wine-based version I'm providing at Mp3tag for macOS.
Mp3tag on Linux
On Linux you can simply install Wine (or compile the latest version yourself). If something stops working for you, just drop a note here in the forums. If you need to use Windows Media Audio (WMA) files, you need to install the Windows Media Runtime wmfdist.exe from Microsoft in Wine.