SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
Guitar Pro 7 - Create, play and share your tabs
keezy - A colorful soundboard. Play with music.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Splice - Music creation, collaboration, and sharing made simple.
OpenMPT - OpenMPT is a popular tracker software for Windows.