List 3D Software (Freeware/Open Source)

[tkbd]

3D Plant Gnerator(For Windows/OSX/Linux).

Arbaro
Mainly, parameters specify by text box input.
It can 3D-Preview.

ngPlant
It can create a wide variety of plants,also can 3D-Preview.
My Memorandum for ngPlant usage is here

SnappyTree
https://github.com/supereggbert/SnappyTree
Web Application.It can make a plant instantly.This survice can export collada.dae and wavefront.obj formt, but Texture image and .mtl exporting is not yet.
If loaded the .obj file with Wings3D, you can assign a texture.