Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.
Guitar Pro 7 - Create, play and share your tabs
Mythos - Mythos is an Action and MMORPG video game published by Hanbit Soft and developed by Flagship Studios.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Huboard - HuBoard is built from the ground up using the GitHub public API.
OpenMPT - OpenMPT is a popular tracker software for Windows.