atunes pro

aTunes Pro

 2.1.01
Free   
1

Manage an play all your music and have a lot of extra features with this program.

mediamonkey

MediaMonkey

 4.1.21
Free   
32

Manage and otganize all your multimedia files in a simple way with program for your computer.

dapyx mp3 explorer
Trial   
1

Create a data base of your MP3 and find them whenever you want.

nightingale

Nightingale

 1.12.1
Free (Open Source)   
9

This application is similar to iTunes but you will have more power with it

niko neko pureya

Niko Neko Pureya

 0.9.8.3a ALPHA
Free (Open Source)   
1

With this application you can play music with manga design

trout

Trout

 1.0.4.96
Free (Open Source)   

Trout is a music player with low weight that you can have in your computer

songbird portable
Free (Open Source)   

It has the best of iTunes and add some new things

qoobar

Qoobar

 1.1.3
Free (Open Source)   

This is a program for tagging all your favorite classical music songs

denemo

Denemo

 2.0.12
Free (Open Source)   
1

This is a graphical editor of sheet music

wavesurfer

WaveSurfer

 1.8.8
Free (Open Source)   

This application allows you to edit any audio file

jajuk

Jajuk

 1.10.3
Free (Open Source)   

One of the best programs that allows you to organize all your music.

atunes

aTunes

 3.1.2
Free (Open Source)   

You will have all your mp3 files well organized with this application

darkwave studio
Free (Open Source)   

With this program you will be able to emulate a modular virtual studio

itunes
Trial   

The perfect tool to add music from your hard disk to your iTunes libraries.

itunes

iTunes Agent

 1.3.3
Free (Open Source)   

A tool to extend the use of iTunes for users that do not own an iPod.

itunes
Free   

Now, use iTunes for any type of portable audio player you have.