Although I have some bought plugin/bundles (like Native Instruments Komplete 13, and some separate plugins from other manufacturers), there are many free plugins available.
So on my desktop (not using it for gigging), I installed a lot of them, as you can see in the screenshots below. And they ALL work inside GP. I only installed VST3 or VST2 versions, all 64 bit of course.
In total I installed 1865 plugins (one DLL is needed for a plugin, so cannot remove it).
And two screens showing the plugin ‘manufacturers’.