ATKUniversalVariableDelay is a free delay and echo VST, VST3, Audio Unit plugin developed by Matthieu Brucher. Compatible OS(s): Windows 64b, macOS.
ATKUniversalVariableDelay is a delay/echo effect, with feedforward and feedback channels with a variable/sinusoidal delay. It enables effects like vibrato or flanger.
http://www.audio-tk.com/