Stave'n'Tabs - iOS and macOS notation and tablature editor with MIDI and MusicXML files support and chromatic...
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!
Aria Maestosa - Aria Maestosa is an open-source (GPL) midi tracker/editor.
alphaTab - alphaTab is a cross platform music notation and guitar tablature rendering library.
Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music
forScore - With forScore, your sheet music has never been better—it’s everything you can do with paper, and so much more.