VCV Rack - A cross-platform modular synthesizer.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
miRack - Eurorack-style modular synthesizer for iOS.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.