Audio Tag Editor
Kid3 audio tag editor can edit the tags of MP3, Ogg, FLAC, MPC & WMA files in an efficient way, convert between ID3v1 and ID3v2, set the tags of multiple files, generate tags from file names or vice versa and import from freedb, MusicBrainz and Disco
Search, Download, Play, Share on Bittorrent, YouTube and the cloud
FrostWire http://www.frostwire.com/ is a media player and Peer to Peer (P2P) information sharing client for the BitTorrent network. This project is not affiliated with LimeWire LLC. FrostWires' source code is Licensed under the GNU GPL Open Source license
UMPlayer is a cross-platform multimedia player supporting many audio and video codecs and file formats as well as DVDs, VCDs, and various streaming protocols. It boasts many advanced features such as built-in subtitle search and YouTube player.
Cross-platform player and audio manager
aTunes is a powerful, full-featured, cross-platform player and manager, with support for online radios, podcasts and CD ripping.
The KDE FM and Internet Radio App
KRadio is an AM/FM/Internet radio application for KDE4. It has support for V4L and V4L2 radio devices, internet radio, RDS, lirc remote control, MP3 and Ogg/Vorbis recording, TimeShift playing, alarms and much more. Try out!
Ampache is a Web-based audio/video file manager. It allows you to view, edit, and play your audio files via the Web. It has many features including Last.FM scrobbling, an extensive API and on the fly transcoding.
WebJukeBox is a MP3 player that controled by Web Browser over own internal http server. By the way you can create and play mp3 list over the network by using a web browser.