This add-in is available in the Add-Ins section of the JMP Community. Find it here: https://community.jmp.com/t5/JMP-Add-Ins/3D-Plot-Tools/ta-p/48699/jump-to/first-unread-message
Source code is available on github: https://github.com/himanga/JMP3DPlotTools
Copy the contents of the src folder to a zip file, then change the file extension to .jmpaddin