Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
ChordU - Extracts chords from any song, integrated YouTube.
GNUitar - GNUitar is guitar effects software that allows you to use your PC as guitar processor.
Tune Transcriber - Learn and transcribe music for free from your web browser (no install needed).
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.
Amazing Slow Downer - !A slow down music software for Mac and Windows computers - Amazing Slow Downer