Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Guitar Pro 7 - Create, play and share your tabs
GNUitar - GNUitar is guitar effects software that allows you to use your PC as guitar processor.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.
OpenMPT - OpenMPT is a popular tracker software for Windows.