ORGANON 9.1 is free to download from our software library. This free program was originally designed by Oregon State University College of Forestry. The software is included in Education Tools.
From the developer:
ORGANON is an individual tree growth model developed for Southwest Oregon, Northwest Oregon, the lands of the Stand Management Cooperative, and red alder plantations in Oregon and Washington.
You may want to check out more software, such as AtamA, which might be similar to ORGANON.