Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
AmpliTube - Guitar Amp & FX modeling plug-in • Amp, Stomp, Cabinet + Mic, Rack FX modeling
GNUitar - GNUitar is guitar effects software that allows you to use your PC as guitar processor.
Ampire - State Space Modeled guitar amp/cab/stompbox simulator.
TH-U - World class guitar amps and effects for PC and Mac
go-dsp-guitar - A cross-platform multichannel multi-effects processor for electric guitars and other instruments.