iD3 Editor [for Mac]

iD3 Editor is an open source project that helps music lovers to easily update tags of the music files. It provides features listed below:
1) batch processing music files;
2) cover art support;
3) fixing the character encoding of tags (more than 30 language encodings);
4) conversion between tags and file names;

iD3 editor supports popular music file types such as mp3, ape, flac, ogg, oga, spx, mp4 and wav.

The source code of iD3 Editor can be found at Github:
https://github.com/qiangyu/iD3Editor