First one is Apparency, which allows you to inspect the status of VST3 and AU plugins. You can see the signature and notarisation and the property list strings.

Here's Rhapsody VST3:

The AU has some extra property list strings, and one of them is a dead giveaway that it's a HISE plugin

Next app is Suspicious Package, which allows you to inspect your installer PKGs - what files they install and where, what scripts they run, the installer code sign and notarisation and more.

Here's the Rhapsody 3.0.0. installer PKG:

What's very cool is that you can drag and drop from the All Files tab in Suspicious Package, into Finder. So if you just want to grab any of the assets for a closer look, just drag them into a Finder window.

Oh, and it has a Finder Quick Look action too, so you can see the main details from Finder by hitting spacebar: