where is the blender rock generator addon? Here's the tut:

https://www.youtube.com/watch?v=uJRDj-fwkG4&amp;t=508s

The reason why I'm asking is, that there seem to be many different rock generators, all the links I've found on the web point to other rock generators (such as here) and were wrong.
You can download the add-on from here: use the "Download > Direct Download" button that will create a .zip file.

You will be able to install the add-on from File > User Preferences > Add-ons, using "Install from File" and selecting the zip file. You don't have to unzip it!

I haven't extensively tested it, but the basic features seem to work on Blender 2.79b on Ubuntu (even if the file is much older).

More in this answer by Thom Blair III. I don't know who maintains the Dropbox link above.