ftp://ftp5.jp.freebsd.org/pub/FreeBSD/development/FreeBSD-CVS/ports/math/  direct

[DIR]R/  direct  1000+ twin directories
[DIR]GiNaC/  direct  46 twin directories
[DIR]PDL/  direct  280+ twin directories
[DIR]R-project/  direct  39 twin directories
[DIR]abakus/  direct  350+ twin directories
[DIR]abs/  direct  480+ twin directories
[DIR]asir2000/  direct  41 twin directories
[DIR]asymptote/  direct  340+ twin directories
[DIR]atlas/  direct  750+ twin directories
[DIR]biggles/  direct  41 twin directories
[DIR]bihar/  direct  45 twin directories
[DIR]blas/  direct  540+ twin directories
[DIR]blocksolve95/  direct  39 twin directories
[DIR]ccmath/  direct  80 twin directories
[DIR]cgal/  direct  270+ twin directories
[DIR]chryzodus/  direct  39 twin directories
[DIR]convertall/  direct  270+ twin directories
[DIR]R-a4/  direct  38 twin directories
[DIR]R-letter/  direct  38 twin directories
[DIR]Scilab/  direct  41 twin directories
[DIR]algae/  direct  111 twin directories
[DIR]apc/  direct  132 twin directories
[DIR]arpack++/  direct  330+ twin directories
[DIR]bamg/  direct  42 twin directories
[DIR]blitz++/  direct  380+ twin directories
[DIR]calc/  direct  900+ twin directories
[DIR]calcoo/  direct  400+ twin directories
[DIR]calctool/  direct  55 twin directories
[DIR]clarence/  direct  48 twin directories
[DIR]clp/  direct  176 twin directories
[DIR]concorde/  direct  45 twin directories
[DIR]coq/  direct  450+ twin directories
[DIR]cvc3/  direct  39 twin directories
[DIR]digitizer/  direct  81 twin directories
[DIR]drgenius/  direct  127 twin directories
[DIR]e/  direct  1000+ twin directories
[DIR]eigen/  direct  410+ twin directories
[DIR]emacs-calc/  direct  39 twin directories
[DIR]emc2/  direct  43 twin directories
[DIR]eukleides/  direct  430+ twin directories
[DIR]facile/  direct  400+ twin directories
[DIR]fann/  direct  102 twin directories
[DIR]fbm/  direct  133 twin directories
[DIR]fftpack/  direct  103 twin directories
[DIR]fftw/  direct  750+ twin directories
[DIR]fftw3/  direct  540+ twin directories
[DIR]fftw3-float/  direct  39 twin directories
[DIR]fityk/  direct  360+ twin directories
[DIR]freefem/  direct  330+ twin directories
[DIR]freefem++/  direct  41 twin directories