Saturation Knob
by Softube

Free one-knob distortion from Softube with three saturation modes, useful anywhere from bass to drums to vocals.
Saturation Knob is a single-knob saturator modeled on output-stage distortion, with a three-way switch that shifts the emphasis between low, neutral, and high harmonics. It is simple by design and works well for thickening bass, drums, and vocals without much tweaking. Installation goes through Softube Central and needs a free Softube account plus an iLok account, though machine activation works and no dongle is required.
In action
Video plays from YouTube when started.
More in Saturation
CHOW Tape ModelFreeOpen-source reel-to-reel tape emulation from Chowdhury DSP with deep control over tape saturation, wow, flutter, and playhead loss.
VST3 VST2 AU AAX CLAP LV2 Standalone·Windows macOS Linux
TDR VOS SlickEQFreeFree three-band semi-parametric EQ with four curve models and optional output saturation, aimed at quick mix moves.
VST3 VST2 AU AAX·Windows macOS
VinylFreeby iZotope
Free lo-fi effect from iZotope that adds record noise, dust, scratches, and warp to any track.
VST3 VST2 AU AAX·Windows macOS