JavaScript - Lightweight, interpreted, object-oriented language with first-class functions

Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music

Qt - Powerful, flexible and easy to use, Qt will help you not only meet your tight deadline, but also reduce the maintainable code by an astonishing percentage.

Chordsheet Maker - Create chord sheets or lead sheets quick and easily from your iPad. Add rhythms, endings, segno, codas and all what's necessary for your musicians to know what's your music about. Transcription made easy!

WebGL - WebGL is a JavaScript API for rendering interactive 3D computer graphics and 2D graphics within any compatible web browser.

Aria Maestosa - Aria Maestosa is an open-source (GPL) midi tracker/editor.