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.
Maxime Conquy has shared a free pack of 3 metal materials for Substance Painter. You could use these substances for armor sets, vehicles or something else.
Some smart materials I made for personal use in Substance Painter. It started as an experiment to see what I could do with SP only and I got carried away.
I thought it might be useful to other people so I’m putting it online for a small fee. I’m thinking about making other packs in the future, let me know if you have materials you want to see