Is Lemony around I know he likes using Terragen?
This is the rather more complicated second generation Terragen.It's not Terregen 2 yet but it is free to play with in a non commercial way and is available on licence for commercial purposes.
I'm sorry to say that it will require a new learning curve because it isn't like the original BUT it does allow for import of objects unlike the original.It seems a little more intuitive(you can get a render pretty quickly) but it does seem to have a lot more to offer 'under the hood' to get some of the super results at the planetside site
TG2 galleries.
I've had a go but unfortunately I've had lots of new toys to play with recently...Bryce 6,a new light plug in for Daz Studio and the brand new Victoria 4.This is one that I will have to take time to learn...but at least it is free...oh and then I have to decide do I want...well enough of that...that would be spamming.