Freeware for visualizating terms and their frequencies?

[Loet Leydesdorff]

> http://services.alphaworks.ibm.com/manyeyes/home 
> 
> Christina K. Pikas, MLS 
> R.E. Gibson Library & Information Center
> The Johns Hopkins University Applied Physics Laboratory 
> Voice  240.228.4812 (Washington), 443.778.4812 (Baltimore) 
> Fax 443.778.5353 

This is beautiful. One can use in most cases the file matrix.dbf produced by
my programs for generating the input matrices. Using Excel one may have to
edit the variable names a bit. 

With best wishes,  Loet