I would love to make this a universal plug-in that supports multiple DCCs, but as it stands it's a personal project I make available to users. I use Maya and Terragen so that's where it starts.
It's a lot of work to develop and it would only make sense if there was sufficient demand for a particular DCC, particularly a DCC I don't use (and would have to learn), but if there was I would consider developing and selling it.
As you can see there hasn't been a great response on this thread, so I assume there isn't really a demand to justify the time. Perhaps I'm posting on the wrong forum.
Though if there were an app supported, it would be Blender, based on the couple of replies had here and the fact it is free and might appeal to Terragen users.