Greenworks is a german based company who created the XFrog software, as long as all the plant libraries; most of the libraries were made by Walli & Orio, whom you may know from this gallery.

Their plants have been used in many feature films, including War of the World (and I think they were the only interesting bit in this lame movie!), the Incredibles, The polar Xpress, etc, etc...

Check their website:

http://www.xfrogdownloads.com/greenwebNew/news/newStart.htm