PlugIt is a script for Maya by Chauliac Romain that will help you add more details to hard-surface models.
The tool allows users to add pre-built plugs to meshes in one click. The script also gives control over scale, rotation, connections, and other elements.
Take a look at its trailer to see PlugIt in action:
As of this moment, the script doesn’t allow users to generate custom plugs, so you are limited to the ones provided in the pack.
PlugIt is compatible with Maya 2015-2018 for Windows, MacOs, and Linux.
You can find more details here.