MP3SQL allows one to index MP3's with MP3Tags into an SQL databse such as MySQL. Also included is an example PHP3 script for searching the database. There is also an playlist add function and an great playscript that reads your playlist and if there is no entries it randomizes from all your mp3s.
mp3tools is a set of utilities (mp3id3, mp3info, mp3index, and mp3gui) for managing collections of MPEG audio files. It can get information such as bitrate and play length about a file, view and alter ID3 tags, and generate completely customized listings. All of these functions can be done either from the command line or a GUI.
mp3_check helps to identify in explicit detail MP3s that do not correctly follow the MP3 format. It also looks for invalid frame headers, missing frames, etc., and generates useful statistics. This can be especially important when building an archive, and you want high quality MP3s.
mpegrec (and wavrec, which is bundled with this program) provide direct-to-disk recording of wav and mp3 files from your sound card. 'lame' is required for mpegrec to encode audio on-the-fly to mp3. mpegrec is a simple, multithreaded (and multi-buffering) C application. It has been tested on a dual PII-450 running Linux Mandrake 7.0 with a Soundblaster PCI128 and works well capturing audio at 44.1kHz stereo directly to a 192kb mp3 file. The commandline interface is simple and allows recording for a specified number of seconds, or until Control-C is hit.