Webplay creates, from a collection of MP3s and Ogg Vorbis files (indexed from a directory or MySQL/PostgreSQL database), a Web-based jukebox with support for multiple independent streams. If Lame/oggenc are available, it can change the bitrate or codec of a file in real time to a selectable value. Each user controls their stream via a Web interface and can skip back, forward, or to a specific track; increment or decrement the bitrate; and check the current playlist, song, or bitrate. Playlists can be looped, randomized, played locally on the webserver, edited, deleted, reused, or renamed.
wxMusik is a fast and lean music library player for Windows and Linux. It supports MP3, MP2 , Ogg, APE, MPC, and FLAC, WAV, and AIFF formats on all platforms and WMA on Windows. It features powerful dynamic playlists that use SQLite, supports listening to Icecast and Shoutcast streams in a reliable manner, and has a nice cross-fading feature and a really cool autodj feature.
x10mp3 is a plugin for XMMS to control it using X10's Mp3Remote, which comes with Mp3Anywhere, Mp3Anywhere 2000, or DVDAnywhere. It has all the functionality of X10's BOOM2000 software for Windows, plus other handy features like muting, skipping around inside tracks, and balance control.