The source code and object code of the PLATO software for cluster analysis may be downloaded as a tar archive file. If double-clicking the file does not expand it, type this in the Mac OS X Terminal or UNIX command line after changing the directory:
gnutar -pxf plato.tar
PLATO is compatible with Windows, UNIX, Linux, and Macintosh operating systems.
PLATO is described in D. R. Bickel (2003) "Robust cluster analysis of microarray gene expression data with the number of clusters determined biologically," Bioinformatics 19, 818-824.