TSE Audio has released the R47 stompbox emulation of a famous rodent-pedal in VST and AU plug-in format. R47 can offer a crystal clean sound on its lowest distortion setting, to a dirty high-gain beast on its highest setting. The tone control gives you control over the overall brightness/fizzyness. Use this plug-in in front of an amp-sim or alone of a cabinet simulation and spice it up with your favorite effects.
R47 is available for free a s VST/AU plug-in for 32/64-bit Windows and Mac OS X at TSE Audio.