To use the AddIn_Inspector, just download and install the attached file.
In line 28, you can list the AddIns you want to look at:

If the AddIn is installed in the system, it will show up in the Tree Structure on the left of the GUI:

To install an AddIn, please download it from the Marketplace:
Quickselect Toolbar
Graph+Builder+Toolbar
Namespace Inspector
Normalization+GUI
The AddIn for the custom Expiry Warning can be found here:
https://community.jmp.com/t5/JMP-Scripters-Club-Discussions/JSL-Challenge-Expiry-warning/m-p/874939/...
for AddIns like Mastermind and ExpiryWarning/XKCD_mode, please contract me via @hogi