Musink is music-composition software that lets you compose scores, exercise books, and MIDI files. You can download it from Musink's main website.
This wiki contains detailed information on the features of Musink, and how to use them.
If you are new to Musink, start with either the first score tutorial or the writing drums in Musink Pro tutorial.
If you are looking for something specific, use the search box, or select from a topic on the left (desktop) or in the menu (mobile).