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.
GPU Technology Conference 2014: Machine Learning Intro (Part 3)
Co-founder and CEO of NVIDIA Jen-Hsun talks about the great computational power needed to enable machine learning.