Question: Software for Cartograms?

S. P. Low from the University of Singapore, looking for software to make cartograms, writes:

We are working on a project that attempts to track the global construction market using cartograms, such as those rectangular cartograms used by the World Bank’s where size of a variable (say population) dictates the size of the rectangle for a country. We came across your fantastic website, searched the archive but couldn’t find an answer to our question. Would you be able to advise if there is such a software available which we can purchase for this purpose?

See previous entries: Cartograms from Worldmapper; Cartograms and Map Distortions; Electoral Maps Made Proportional; Even More U.S. Presidential Election Maps; U.S. Elections Results Cartogram.