knotplot [the libarynth]

knotPlot

home/refs/download/

http://knotplot.com/
the “hopelessly out of date (and sometimes wrong) version of the manual” » http://www.pims.math.ca/knotplot/manual/KnotPlotManual.html

other

http://www.cs.ubc.ca/nest/imager/contributions/scharein/KnotPlot.html