ftp://ftp.nrc.ca/pub/systems/bsd/freebsd/development/FreeBSD-CVS/ports/math/  direct

[DIR]R/  direct  1000+ twin directories
[DIR]GiNaC/  direct  56 twin directories
[DIR]PDL/  direct  340+ twin directories
[DIR]R-project/  direct  50 twin directories
[DIR]abakus/  direct  420+ twin directories
[DIR]abs/  direct  520+ twin directories
[DIR]asir2000/  direct  51 twin directories
[DIR]asymptote/  direct  410+ twin directories
[DIR]atlas/  direct  900+ twin directories
[DIR]biggles/  direct  51 twin directories
[DIR]bihar/  direct  55 twin directories
[DIR]blas/  direct  680+ twin directories
[DIR]blocksolve95/  direct  49 twin directories
[DIR]ccmath/  direct  92 twin directories
[DIR]cgal/  direct  330+ twin directories
[DIR]chryzodus/  direct  49 twin directories
[DIR]convertall/  direct  330+ twin directories
[DIR]R-a4/  direct  48 twin directories
[DIR]R-letter/  direct  48 twin directories
[DIR]Scilab/  direct  51 twin directories
[DIR]algae/  direct  190 twin directories
[DIR]apc/  direct  152 twin directories
[DIR]arpack++/  direct  390+ twin directories
[DIR]bamg/  direct  52 twin directories
[DIR]blitz++/  direct  500+ twin directories
[DIR]calc/  direct  1000+ twin directories
[DIR]calcoo/  direct  480+ twin directories
[DIR]calctool/  direct  70 twin directories
[DIR]clarence/  direct  58 twin directories
[DIR]clp/  direct  220+ twin directories
[DIR]concorde/  direct  55 twin directories
[DIR]coq/  direct  580+ twin directories
[DIR]cvc3/  direct  49 twin directories
[DIR]digitizer/  direct  96 twin directories
[DIR]drgenius/  direct  162 twin directories
[DIR]e/  direct  1000+ twin directories
[DIR]eigen/  direct  480+ twin directories
[DIR]emacs-calc/  direct  49 twin directories
[DIR]emc2/  direct  53 twin directories
[DIR]eukleides/  direct  540+ twin directories
[DIR]facile/  direct  460+ twin directories
[DIR]fann/  direct  128 twin directories
[DIR]fbm/  direct  165 twin directories
[DIR]fftpack/  direct  162 twin directories
[DIR]fftw/  direct  900+ twin directories
[DIR]fftw3/  direct  640+ twin directories
[DIR]fftw3-float/  direct  49 twin directories
[DIR]fityk/  direct  430+ twin directories
[DIR]freefem/  direct  390+ twin directories
[DIR]freefem++/  direct  51 twin directories