Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
TH-U - World class guitar amps and effects for PC and Mac
Scale Heaven - Browse and play any scale/chord, chord progression.
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.