Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music
Angle Finder™ - Angle Finder™, now rebranded to Protractor+, is an app that offers a handy protractor tool on your phone.
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!
70 Degree : Smart Protractor - 70 Degree : Smart Protractor is an app that allows you to measure angles on the go with your iPhone or iPad.
Aria Maestosa - Aria Maestosa is an open-source (GPL) midi tracker/editor.
Clinometer + bubble level - Clinometer+ bubble level is a handy tool that measures angles and inclinations using your device’s camera.