Thanks, I found the tool: https://toolshed.g2.bx.psu.edu/view/kosrou/ngs_plot/b848d0eb3841
It is an older tool submitted by a community contributor. I haven't used/configured it myself. This is the author's only tool, it doesn't have a readme or install instructions, and there are no associated tool tests or a linked development repository.
If you still want to try to use this tool, contact the tool author for installation/config help through the Tool Shed (login or create an account > navigate to the tool (or use the link above) > Pick "contact author" from the Repository Actions menu.
Thanks! Jen, Galaxy team