It is a pretty basic application which can create/delete/manage Sets, Discs and Tracks (when uploading, the user can choose which ID3-tag will represent which level).
If manipulating some values in the Windows Registry, a hidden menu appears, which can be used to debug and in some cases repair a damaged TOC.
This software has the same uploading capabilities of Sets/Discs/Tracks as the Jukebox Manager, but also provides additional features, such as mass-uploading, synchronizing, a playlist manager, creation of CUE-sheets, advanced search and sorting options, uploading of non-MP3 data files as well as the ability to re-download tracks to the PC or the playback of tracks on the PJB via the computer's audio hardware in real-time.
The OpenPJB/pjbsdk Project on SourceForge tries to provide a base for all (open source) PJB applications, while also further developing the SDK.
These range from Jukebox-Manager-like applications with a GUI for various window managers to projects making the PJB's file system mountable as a drive in Linux.