AXP has released SoftAmp GT, a free guitar amplifier effect plugin for Windows.
SoftAmp GT is a virtual emulation of a well-known analog guitar amplifier simulator stomp-box. The prototype is a solid state circuit that uses op-amps to saturate the signal and moderate filtering to shape the tone throughout the signal path.
The speaker simulation is achieved by a steep low-pass filter as well as some middle-frequency manipulation to resemble different microphone positions.
The plug-in is freeware for Windows (VST).
More information: AXP
