Ed Pegg writes "I did a survey of all available vector-based drawing programs, in anticipation of SVG in the next Firefox. I found 29 different vector drawing programs. Of these, 14 were free or open source. More than I expected. Did I miss any good ones?"
Thus mathematics may be defined as the subject in which we never know
what we are talking about, nor whether what we are saying is true.
-- Bertrand Russell