mIRC

Chat on IRC with this great client

Trillian

A multiplatform chat client

Melody Assistant

Compose music with a classic method with plenty of options

ICQ

Complete instant messaging client integrated with social networks

Guitar Tuner

How to tune your guitar or any other string instrument

Yahoo Mail

Access to your Yahoo email account

Turbo Mailer

Send mass emails

TuxGuitar

Create and edit your own guitar tabs

Microsoft Outlook

Microsoft's email client

IncrediMail

Customize your email's appearance and give your friends a surprise

OpenSong

Manage song lyrics, chords and scores

Harmony Assistant

Excellent program for musical notation and creation

Visual Chat

Create your own chat channel in 3D

Pirch

One of the most popular IRC clients of its time

Windows Live Mail

Microsoft's multi-account email client

Chord Scale Generator

All the scales and chords a your reach

Dany's Virtual Drum

Simple simulator to play the drums

Crescendo Music Notation Editor

Write your music scores on the computer

AP Tuner

Practical tuner that is specifically for string instruments

Encore

One of the best applications for music notation

PDFtoMusic

Listen to your favourite sheet music from PDF files

Piano Marvel

Entertaining and effective classes to learn to play the piano online

Mario Paint Composer

Compose music with sounds from Mario Bros

MuseScore

Versatile music notation application that's totally free

Finale

Advanced tool to compose scores

Sibelius

A musical notation program aimed at professionals

Overture

Create your scores and play them with VST instruments

EarMaster

Train your music hearing

Guitar Pro

Compose your own guitar scores and tabs

Synthesia

Learn how to play the piano while having fun

Music Maker

An ideal program for non-professional musicians