Generative Modeling Toolkit for Blender 2.8
BY-GEN is a free and open-source add-on designed to simplify the process of creating non-destructive, generative modeling styles in Blender 2.8.
It makes heavy use of the modifier stack to provide various forms of mesh-manipulation to let you achieve a variety of geometric effects. Through the use of a simple interface, you can either generate new objects from scratch or apply styles to pre-existing objects.
Please watch the associated videos for more information:
Install from the zip provided. If the add-on does not immediately appear in the add-on list, then you can manually move the files into the correct directory.
See here for assistance with troubleshooting installation issues.