One of most popular free VSTs was finally updated with 64 bit support. It is available as VST/VST3/AU format for MacOS and VST/VST3 format for Windows. That was done by migrating the source code to JUCE.
SMEXOSCOPE is a waveform visualisation plugin. It’s a great tool developed by the guys over at Smart Electronix, who did us all a solid and released it for free!
Download s(M)exoscope completely free here