If you’ve collected too many Plugins over the years, there is a great, free, cross-platform program called OwlPlug at https://owlplug.com
It scans your system and displays a list of all the VST2/3, AU, and other format plugins you have installed. It’s really handy.
You can get it via the GitHub page at Releases · DropSnorz/OwlPlug · GitHub
On new OSX machines, due to the increased security of the OS, you’ll need to enter in the following command
sudo xattr -rd com.apple.quarantine /Applications/OwlPlug.app/
This was something I was looking to code myself but Author, the programmer is brilliant and beat me to it.
He’s also really open to feature requests and feedback.
A Brill program!