Tag editors that use GTK

Rhythmbox is a free and open-source audio player software, tag editor and music organizer for digital audio files on Linux and Unix-like systems.

EasyTag (stylised as EasyTAG) is a free and open-source graphical tag editor that is part of the GNOME project. EasyTag runs on Linux and Microsoft Windows, and there was an attempt to bring EasyTAG to OS X circa 2014. It is written in C and relies on GTK+ and id3lib for graphics and ID3 tag handling respectively. As of version 2.1.1, EasyTag also uses the tag manipulation library provided by the MAD project, for support of ID3v2.4.

music player, tag editor and library organizer