csv2png and csv2jpeg use the GD library to plot time series data from a CSV file to either a PNG or a JPEG graphic. The program is deliberately simple, and is targeted at CGI applications. Originally written for RISC OS as csv2gif (see Acorn User, issue 215) the latest distribution builds on Linux as well.
ctrlxmms is a small Perl script designed to increase the useability of XMMS. With it, you can use most of the common GUI functions of XMMS from the CLI. You also have a few handy commands which are not available from the GUI. Together with lirc and a remote (eg. Anir Multimedia Magic), this is a wonderful tool.
cdlabelgen generates frontcards and traycards for CDs. It was designed to simplify the process of generating labels for CD's. It originated as a program to allow auto generation of frontcards and traycards for CD's burned via an automated mechanism (specifically for archiving data), but has now become popular for labelling CD compilations of mp3's, and copies of CDs as well.
CDR-Toaster is a Tk frontend for writing CDs. It is a graphical front-end for the excelent programs 'mkisofs', 'cdrecord' and 'cdparanoia'. It may be used to burn audio, data, bootable, and combo CDs. It can also rip audio and data tracks. CDR-Toaster can even burn mp3s as audio CDs.