I'm a regular user of mp3tag and I think this is the best mp3 tag editor out there.
The only problem I have, it is only freeware on windows.
The only post I have found regarding this issue is this one:
It is said that since code of mp3tag is used in commercial application, it cannot be open source. From a purely license point of view, this is a non-issue : code can have both an open source license and other license (for including in other products). There are many example of such multi-license, for example mysql or QT from trolltech. Moreover, you can have a license that specify that open source is good only for linux for example.
If there are other reasons I perfectly do understand. But maybe in this case only a port (also freeware) to linux can be done. If needed, I could lend a hand with this port. I ported back and forth for windows to linux some applications with success.
This leads me to the final question : what kind of technology/libraries are used in mp3tag ? From the binary, I see there are not any .dll packaged with it, is it pure win32 ? What kind of library is used for window management (this is probably the biggest difficulty for porting an app from windows to linux). If the devs wish to keep the details secret, I can also understand.
Anyway, thanks for any answer on this matter.