Gig Performer is an audio plugin host that has been shown to be very reliable in terms of its ability to load plugins (VST2, VST3 and AU (Mac only) from pretty much every plugin developer out there. Plugins from all the major developers (Native Instruments, Arturia, Spectrasonics, Synthogy, Applied Acoustic Systems, GG Audio, U-He, GForce Software, Plugin Alliance, among many others) work perfectly fine.
Unfortunately, there are a couple of exceptions. Click here to learn more: https://gigperformer.com/gig-performer-and-some-waves-plugins/