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Guitarix is a virtual guitar amplifier for Linux running on Jack Audio Connection Kit. It is free as in speech and free as in beer. The available source code allows to build it on other UNIX-like systems, too, namely for BSD and for Mac OS X.
Guitarix takes the signal from your guitar as any real amp would do: as a mono-signal from your sound card. The input is processed by a main amp and a rack-section. Both can be routed separately and deliver a processed stereo-signal via Jack. You may fill the rack with effects from more than 25 built-in modules including stuff from a simple noise gate to brain-slashing modulation f/x like flanger, phaser or auto-wah.
Your signal is processed with minimum latency. On any properly set-up Linux-system you don't have to wait more than 10ms until your sound is processed by Guitarix.
Guitarix is amazing. I just want to point out that that Mac and windows comparability comes with a giant asterisk. They are both branched from ancient forks of the source code and there are no binaries so you have to compile them for win and Mac, a task beyond the pale for most potential users. I did a double take when I saw Windows compatibility on kvr, but the label is misleading here.
As for the plugin on Linux, it is the best most versatile amp modeler out there and Linux, unlike windows, can actually do real time, so I have run guitarix on Linux on a computer from 2009 at 32 samples at 48kHz sample rate. To give some context, that means 0.67ms latency, which is like instantaneous with the speaker moved 8 inches further away from you. It is a whole different feel from using a 128 sample buffer.
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