NtEd - Music Score Notation editor.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Waves GTR - From Fender® to Marshall®, Mesa/Boogie® to Vox®, and more, Waves has captured...
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
go-dsp-guitar - A cross-platform multichannel multi-effects processor for electric guitars and other instruments.