Scientific libraries

Python

 * SciPy - NumPy

Linear Algebra

 * Netlib BLAS - Lapack (C/C++, Fortran)
 * NAG (commercial)
 * IMSL (commercial)
 * POOMA (C++)
 * Matrix Template Library (C++)
 * Open Systems Lab (C++)

Boost (C++)

 * Array
 * Special functions
 * Random nnumbers