Lava's jWave is a versatile set of packages for Java that allow you to easily create and process RIFF files, with a special emphasis on reading and writing Microsoft PCM .wav files. jWave was initially released as an integrated feature of Lava, a general-purpose class library for Java. By popular demand, it is distributed in its own bundle.
Drip is a DVD to divx conversion tool. The application is GNOME based, but the encoding part of it is available as a textmode tool. Using the GUI just makes it all easier, and adds some logic, like automatic filenaming and subpicture detection. Drip does the whole job in 1 go; no user interaction is needed during runtime.
mp3clean takes a list of files and presents each file's ID3 tag for re-editing. If no ID3 tag is found, mp3clean will go through great effort to clean up and create a suggestion for ID3 tags from looking at the filenames. When you are satisfied with the ID3 tags, mp3clean will create a nice filename from the ID3 tag, based on your format string and general cleanup rules.
Distributed MP3/Ogg Encoder is a distributed MP3/Ogg encoder/ripper front-end. To use this you run one script to rip a CD into .wav files, and you run the other one on as many computers as you have. This second script examines the .wav files, encodes them, and writes them out as .mp3 or .ogg files. It has FreeDB support. Requires a ripper program, an encoder program, and a few Perl modules.
mpg321 is a Free clone of mpg123, a command-line MP3 player. It is designed to be a drop-in replacement for mpg123, and therefore its interface has been designed around that of mpg123, without using any of its code. mpg321 has been designed for use with frontends such as gqmpeg, although it is just as useful on the command-line. Unlike mpg123, it supports ESD and ALSA output without recompiling, and it does all MP3 decoding with only fixed-point math by using the mad MPEG audio decoder library.