A tool for creating, and editing maps for CNC 3, it has just been released a few days ago. As for me, I have tried it out, and I don't really like the scrolling, as you must right-click everything and it is just horrible. But I do like how you can listen to the ambient noises during mapping, unlike Final Alert.

You can download it (Its actually pretty small, even though it contains many models from CNC 3) here: Download the Worldbuilder

This is also a chance to sneak a peak on what CNC 3 has to offer, but you'll have to learn how to add stuff onto a test map to see what units look like.