I love World Creator, especially the vegetation distribution pipeline. You can create some very realistic fields with it. Im going to check out impostors too - ive seen it a few times and wondered what it's about.
Stupid Rental. My Zbrush that I haven't paid for an update in years and is perpetual Trumps that on all counts.
IndieCade 2012: Game Design 101 (Eric Zimmerman, Bernie DeKoven)
Eric Zimmerman asks videogame designer and writer Bernie DeKoven about his life, the work that he has done, his ideas and how it all relates to games and play today. DeKoven discusses his theatre work with children and his experience in designing videogames.