EdgeSmooth is a free, open source plugin that makes smoothing in 3dsmax a lot easier. It allows you to smooth an editable poly by setting edges to "hard" or "soft". A "hard edge" means that the faces using the edge share no smoothing groups, a "soft edge" is the opposite. This will probably feel familiar to Maya users!
-The plugin uses smoothing groups, so you can mix it with using traditional smoothing. It may however change the smoothing groups on all faces in the object!
-EdgeSmooth only works with Editable Poly objects, not with the Edit Poly modifier.
The source code of the plugin is made available under the BSD license and can be found here: https://github.com/Pjanssen/EdgeSmooth
Here you can also find information about how to use the plugin through maxscript.
If you find this plugin a useful addition to your workflow, please consider making a small donation to support future development and maintenance: http://script.threesixty.nl/outliner/index.php/donate (temporary, I'll create a page for this plugin specifically later).