VVV is an application that catalogs the content of removable volumes like CD and DVD disks for off-line searching. Folders and files can also be arranged in a single, virtual file system. Each folder of this virtual file system can contain files from many disks so you can arrange your data in a simple and logical way.
VVV also stores metadata information from audio files: author, title, album and so on. Most audio formats are supported.
It is possible to share the same catalog, stored in a network server, among Windows, Linux and OSX computers. The network server is simply a computer running a database server program.
Reference: http://vvvapp.sourceforge.net/