ATKGuitarPreamp is a free amp simulator VST, VST3, Audio Unit plugin developed by Matthieu Brucher. Compatible OS(s): Windows 64b, macOS.
ATKGuitarPreamp is a guitar preamp plugin, modeling the inverter input stage of a Vox AC30 followed by a JCM800 tone stack.
Just like a bass preamp, you can dose the amount of distortion, bass, medium and high frequencies. The final stage gives you the option of turning the volume up or down, as well as balance the dry sound with the processed sound.
It is built on top of AudioToolKit and JUCE.
http://www.audio-tk.com/
