Stave'n'Tabs - iOS and macOS notation and tablature editor with MIDI and MusicXML files support and chromatic...
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
Chordsheet Maker - Create chord sheets or lead sheets quick and easily from your iPad. Add rhythms, endings, segno, codas and all what's necessary for your musicians to know what's your music about. Transcription made easy!
GNUitar - GNUitar is guitar effects software that allows you to use your PC as guitar processor.
Tonelib JAM - Create, edit, print and listen to tablature and guitar sheet music
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.