Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
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!
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music
Guitar Pro 7 - Create, play and share your tabs
Aria Maestosa - Aria Maestosa is an open-source (GPL) midi tracker/editor.