Randomize Wire Color 2 is a free script for 3ds Max that assigns random wire colors to selected objects, using softer pastel colors akin to Blender colors.
The script addresses two situations. When you import a CAD model, its wireframes are sometimes all black. And when detached geometry contains numerous parts sharing the same wire color, telling those parts apart becomes challenging. Randomizing the wire colors helps distinguish between them.
Installation is drag and drop: drop the script onto the 3ds Max viewport, then open Customize > Customize User Interface > Menus. Under the "Shiva Tools" category you'll find "Random Wire Color", which you can drag to any Tools submenu or wherever you prefer. It runs on 3ds Max 2015 and later. The script comes from Shiva, a 3D artist with over 20 years of experience in 3ds Max.