Linear algebra packages
From HandWiki
One of the most complete linear algebra subroutine packages available is LAPACK (see Anderson92), which supersedes the packages LINPACK (see Dongarra79) and EISPACK (see Smith76). Linear algebra packages are also part of the popular commercial interactive software packages like Matlab (see MATLAB97, Lindfield95) or Mathematica (see Wolfram91). Both are language-based and cater for numerical computation and visualization, for scientific and engineering applications. Other packages exist, commercial or public-domain, some of them most likely have equal merit as those we happen to mention. For more reading on linear algebra: see Flowers95.