Clustan is one of the oldest integrated statistics programs for cluster analysis and for data mining. Its origin goes back to Fortran progam from 1968. David Wishart is the developer as well as the CEO of the company Clustan Ltd in Edinburgh. In the 90ies he adapted the software to (Windows) PC and provided it with a graphical interactive interface.
Translated from Wikipedia https://de.wikipedia.org/wiki/Clustan