Carve is a free VST, VST3, AudioUnit wave shaping distortion plugin with several available waveforms and two distortion units, which can be configured in serial, parallel, or stereo, and then blended with the dry sound.
GSS-370 is a free FM Synthesizer VST instrument plugin which approximate emulation (sound-a-like) of the Yamaha PSS-370’s synthesizer. “Circuit-bending” modifications have been added as well.
Neviah is a free three tempo-synced delays with an assortment of filters and effects VST Plug-in.
Soft Glow Organ is a free Vintage theater organ rompler vst plugin. And it uses samples from a 1960s electric organ and synthesizer-style controls to produce warm sounds with modern effects.
The Mini-Chord is a free digital chord organ VST instrument inspired by 1970s electric organs which often included a Chord Organ to go along with the traditional keyboard. Use familiar organ sounds and create brand new ones using the tempo-synced effects.