Joliet is a Microsoft extension to the ISO 9660 filesystem that allows Unicode characters to be used in filenames. This is a benefit when handling internationalization. Like the Rock Ridge extensions, Joliet also allows long filenames.
Hybrid CDs contains three filesystems on one disc - ISO9660/RR, Joliet and HFS. Such CD-ROMs are accessible under DOS, Unix, Macintosh and Windows 9x/NT. All three filesystems use the same data, only metadata are the disc three times.
This filesystem add-on will allow you (if your CD drive supports it) to treat a regular audio CD as if it were a bunch of WAV files. You can copy the files, encode them to mp3, play them slower, faster, even backwards.
CDfs is a file system for Linux systems that `exports' all tracks and boot images on a CD as normal files. These files can then be mounted (e.g. for ISO and boot images), copied, played (audio tracks), etc. The primary goal for developing this file system was to `unlock' information in old ISO sessions. The file system also allows you to access data on faulty multi session disks, e.g. disks with multiple single sessions instead of a multi session.