I will release a professional version of Unlimited Drop in a couple of months.
It is almost complete but I need some time to write Help files, Tutorials and make extensive application tests.
It is an application with native WinXP GUI and many more capabilities.
Here are some screen shots of Unlimited Drop Pro (UDropPro):
Main workspace:

Meshes with lights:

Custom properties editor:

Unlimited Drop Prop is not free because there is a lot of hard work behind the scenes. But there will be a special very low price for all those B3D users because without help of this community this project would never be released