Picard QT is the port of Picard away from the troublesome wxWidgets toolkit and over to the much more stable QT toolkit. Along the way Lukas reworked the UI to be more intuitive and added the much anticipated TaggerScript language that gives the user total control over how to tag their music collection. The great news amidst all this is that with QT Picard now runs well on OS X — something that we could never achieve with the wxWidgets toolkit!
We have installers for Windows and Mac OS X and a tarball for our Linux users — grab them from the Picard download page. We’re hoping to have a final release of Picard QT in about a month. In the meantime, please report any bugs you may find.