Pierre Schiller writes:
Speed Tree Cinema is one of top industry packages to create forest assets. The "Cinema version" is one of the most acclaimed applications to simulate natural wind, mesh collision, art directed tree creation and other impressive features.
If you've seen massive natural and accurate vegetation on blockbuster movies or games, chances are those environments were created using Speed Tree.
I beta tested their addon for Blender 2.8. Here's a quick walk through on how to import/export assets between them.