ngPlant

ngPlant is a simple-to-use software application that enables you to generate and export 3D models with various plants and trees with the help of a 3D API-independent library. For instance, the modules can be saved as plugins to further use in other programs.
After a brief and uneventful setup procedure that shouldn't impose any difficulties, you are welcomed by a regular window with a plain and simple structure.
When starting a new project, the tool lets you preview the model in real-time to make sure you're not making any mistakes while tinkering with settings.

Edit general, stem, material and branching properties

So, you can define the randomness factor by specifying the seed amount, increase or decrease the LOD level, as well as edit model information when it comes to the author, author URL, license, license URL, and plant description URL.
In addition, you can modify the axis parameters (length, variation, offset influence, solution, axis variation), cross-section properties (radius, profile, resolution), phototropism distribution, and visibility range (minimum and maximum LOD).
Other customization factors revolve around the material (e.g. base color, texture, texture coordinates, transparency control) and branching (e.g. shape, spread, density, variation, declination, rotation angle).

Save the 3D model or export it to various formats

The project can be saved to file and resumed later, as well as exported to ngPlant archive (.nga), COLLADA plugin (.dae) or Alias-Wavefront plugin (.obj). It is also possible to select a script from an external file (.lua) to run, undo and redo actions, as well as to view dummies.

Evaluation and conclusion

We haven't come across any stability issues throughout our tests, thanks to the fact that ngPlant didn't freeze, crash or pop up error messages. It had a good response time and minimal impact on computer performance, thanks to the fact that it needed low CPU and RAM to work properly.
All in all, ngPlant sports some advanced and useful options for generating and exporting 3D models with plants and trees.