The Cult3D Designer is a free software program that allows you to apply interactivity, sound and special effects to models exported from 3ds max and 3D Studio Viz®. You can add functionality, animations, sound, Java events, particle systems, reflectivity and transparency, and myriad of other special effects to your models.
And the Designer is very simple to use. The drag-and-drop interface makes it easy to create and rearrange event sequences and hierarchies. The preview window shows you the results of your work immediately, so you can make changes before it's too late. The short learning curve makes it easy for you to get your models on the Web with virtually no down time.