http://www.univie.ac.at/future.media/moe/JavaCalc/jcintro.html
http://mss.math.vanderbilt.edu/~pscrooke/MSS/solvepoly.html
http://mss.math.vanderbilt.edu/~pscrooke/MSS/solvesystem.html
http://mss.math.vanderbilt.edu/~pscrooke/MSS/plotseveral.html
http://mss.math.vanderbilt.edu/cgi-bin/MSSAgent/~pscrooke/MSS/derivative.def
http://mss.math.vanderbilt.edu/~pscrooke/MSS/factorpoly.html
http://mss.math.vanderbilt.edu/~pscrooke/MSS/trig.html
http://did.mat.uni-bayreuth.de/~wn/BLK/Rennen/grafcalc.html
http://alumnus.caltech.edu/~chamness/equation/equation.html
http://did.mat.uni-bayreuth.de/~wn/BLK/Rennen/tabcalc.html