DAZ has made their Bryce 5.0 3D modeling and rendering software available for free download through September 6th (their newest version is 5.5). This software package allows you to create 3D environments, including landscapes and animations, through a robust and fairly intuitive interface. You do have to register for a serial number, but, there is no charge for the software!
What’s with all these 3D products? (Thanks, Roland, for the info.)