The tcl programs and other links marked (*) can be run directly in netscape if you have got the tcl/tk plugin. You can also run the tcl programs in the normal way if you have a linux machine with X windows and tcl and you download the tcl files then execute them (this is preferable to the netscape approach, I think). The other programs can be used by people on unix systems who have the relevant software (perl, gnuplot, octave.)