Metronomus - Powerful and beautiful online metronome
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
AudioKit Hey Metronome - Visit the post for more.
GNUitar - GNUitar is guitar effects software that allows you to use your PC as guitar processor.
Open Metronome - Open Metronome, a Free Open Source Metronome for Windows Mobile and Pocket PC.
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.