File and Playlist Managers

Advanced MP3 Catalog
Windows tool with an Explorer-like interface that allows users to catalog MP3 files by adding comments and sorting by quality or specific ID3 tags.
http://www.wizetech.com/amc/

Audio Tags Editor
This file tag editor enables you to edit tags, rename files and folders, export data to various formats and to save playlists.
http://www.audio-tags-editor.com/eng/

DailyMP3: MP3 Playlisters
140+ downloadable programs to manage and/or list MP3 files.
http://www.dailymp3.com/playlisters.html

Dj Quarc
Winamp plugin for managing MP3 files. Allows users to search through their collection and view the most recently played songs and playlists.
http://www.xi-quadrat.de/dj-quarc/

Helium 2
Audio file manager that supports audio files in the formats MP3, Ogg Vorbis (OGG), Windows Media Audio (WMA), MPC and MP+ files. [Windows 98/ME/2000/XP/2003 Server]
http://helium-music-manager.com/

ID3-TagIT
Windows freeware ID3 tag editor with many advanced features. Supports ID3 versions 1.1, 2.3 and 2.4. [English and German]
http://www.id3-tagit.de/

Magic MP3 Tagger
Windows MP3 tagger that has been designed to automatically identify MP3 files. Supports all ID3 tag versions and enables to rename, sort and tag music collections.
http://www.magic-tagger.com

MP3 Boss
Full-featured file management system for MP3 collections. Includes integrated support for Winamp, automatic scanning of ID3 tags, database functions, file cleanup, and general file management.
http://www.mp3-boss.com/

MP3 Detective
Program that searches for MP3 files, manages playlists, and plays (through a default player.)
http://cheqsoft.com/mp3detective.html

MP3 File Editor
Utility to help manage MP3 collections. Combines an MP3 player, tag editor, and file manager. Can rename files based on the ID3 tag, supports M3U playlists, and can export playlists in DBF, TXT, and HTML formats.
http://www.mp3fe.com/

MPEG Script
Utility which reads data from MPEG audio files and creates text file reports displaying artist information, title, and other optional details. Can output to txt, rtf, and html formats with various sorting and grouping options.
http://www.dv.co.yu/mpgscript/

MP3rat
Player, playlist manager, tag editor, and music organizer that supports ID3 version one and two with search. [Shareware]
http://www.kaylon.com/mp3rat/

MP3TAG
An easy-to-use tool to edit metadata of common audio formats. It can rename files, replace characters, import/export tag information, create playlists...
http://www.mp3tag.de/en

Mp3Tagger
ID3 tag utility with the ability to rename MP3s based on tags, create tags based on MP3 name, generate playlists, create backup files of lyrics, and auto-neaten all tags. (Requires the Java runtime environment)
http://ostermiller.org/mp3tagger/

WinCue
Winamp playlist cue program designed for MiniDisc recording. Features a free download, documentation, and a FAQ.
http://www.wincue.org/