investigate adding (sage includes these):

      linbox		    linear algebra
      iml		    
      matplotlib	    2-d plots
      jmol		    3-d plots
      polybori		    polynomials over boolean rings
      m4ri		    fast arithmetic with dense matrices over F2; http://bitbucket.org/malb/m4ri/
      genus2reduction
      symmetrica
      gap
      palp		    lattice polytopes and toric geometry
      polymake		    polytopes
      cddlib		    polytopes	http://www.ifor.math.ethz.ch/~fukuda/cdd_home/cdd.html
      lrs		    polytopes
      porta		    polytopes
      4ti2		    polytopes
      coin/or		    polytopes
