aTunes : A full-featured audio player and manager

aTunes is a full-featured audio player and manager. It currently plays MP3, Ogg, wma, wav, FLAC, MP4, and radio streams allowing users to easily edit tags, organize music, and rip audio CDs.
Licenses : GPL
Operating Systems : POSIX, Linux, Windows
Implementation : Java

OBSearch : A distributed similarity search index

OBSearch is a distributed similarity search index. It can (for example) match programs and help to detect Open Source/Libre license violations, find music that sounds like Sisters of Mercy, or match huge vectors of randomly generated integers just for fun.

• Implementation : Java

Jajuk : A multi-platform music organizer

Jajuk is a multi-platform music organizer. The main goal is to provide a fully-featured application to advanced users with large or scattered music collections. It supports most audio formats.

• Licenses : GPL
• Operating Systems : OS Independent
• Implementation : Java

Sockso : A personal music server for everyone

Sockso is a personal music server for everyone. It's designed to be as simple as possible so that anyone with a mouse and some MP3s can get their friends listening to their music across the Internet in minutes.

• Licenses : GPL
• Operating Systems : OS Independent
• Implementation: Java, JavaScript, PHP, SQL

FX Player : A Web-based streaming server with an iTunes-like interface

FX Player is a Web-based streaming server with an iTunes-like interface. It shares your MP3 library and allow access to your tracks through the Internet. The server side is in Java, and is Java servlet specification compliant (you may install it on Tomcat, Jetty, etc.). It uses JPA for data access (openJpa), Spring transactions, JAX-RS and JAXB (Jersey) for client-server communications, and Apache Derby for data storage. The client side is build on Adobe Flex and ActionScript.

• Licenses: MIT/X
• Operating Systems: OS Independent
• Implementation: Java

pulpTunes : A Web server for the iTunes

pulpTunes is a Web server for the iTunes, letting you access your music through the Web. It runs on Windows and Mac, and even any other platform like Linux, provided you have an iTunes-like XML library file that points at the path of your music files.

Licenses	GPL
Operating Systems	OS Independent
Implementation	Java JavaScript