Freeware - TBProAudio - GSatPlus Saturation VST Plugin

https://www.tbproaudio.de/products/gsatplus

GSat+ is derived from the saturation module on the TBProAudio CS5501V2 channel strip plug-in, but adds extra features requested and suggested by the Gearspace.com team. It has several different saturation modes, high tweakability, oversampling, old-school VU meters.