Dr. Anderson is a coauthor/contributor to a popular freeware package (called PASSaGE 2) for conducting spatial pattern analysis.
As of Spring 2018, PASSaGE 2 had 18,000+ downloads worldwide and the software note is the fourth most cited paper in Methods in Ecology an Evolution.
http://www.methodsinecologyandevolution.org/view/0/toppapers.html
- PASSaGE 2 is still widely used, but because it was developed with Borland Delphi, which is no longer supported, there will be no further releases.