its a 3d land scaping scene dev used it a long time ago, don't know how well it might apply to game dev but hey…free …right?!
http://www.daz3d.com/program/bryce/bryce5free.php
Nice! I used to use Bryce at version 3…it was fun to play around with. 
just read this little gotcha take note
I'd installed it to get the serial and content (for storage and later use), and when I realized that the content would available later I un-installed it figuring I could install it again on the same machine with the same serial / activation when it became available.
However, it would seem that the free version doesn't allow use of the same serial / activation code on the same machine if you choose to uninstall and reinstall later.
Instead, you currently get a new serial / activation code for each install regardless of whether it's a new or old machine. This has lead to multiple different Bryce 5 serials being listed my DAZ account details. I hope this is a bug, rather than intended operation.
It would seem that re-zipping the Bryce 5 folder after activating and installing the presets avoid this behavior since the "Bryce5.dta" file gets included. It now resides on a Portable USB HD and can be freely used on any USB equipped PC.
any you have until sept 6 to get it