audio unit garageband

Alphatron Oscillion VST VST3 Audio Unit Subtractive Synthesizer for Windows/Mac

Phasewaver VST VST3 Audio Unit Polyphonic Phase Distortion Synthesizer

Extreme - synthesizer plugin with 256 presets, built-in effects etc.

Wide Stereo Chorus Effect Plug-in (RTAS, VST, Audio Unit, DirectX) (Freeware)

DiTone is the 11th of the Twister Series line of Audio Unit effects.

Note Gate 2 is a real-time pitch-based Audio Unit volume filter effect.