Scientific libraries

Lists

 * dmoz
 * ubuntu

General purpose

 * Gnu Scientific Library
 * Portable, Extensible Toolkit for Scientific Computation
 * The GNU Multiple Precision Arithmetic Library

Python

 * SciPy - NumPy
 * SymPy

Linear Algebra

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

Boost (C++)

 * Array
 * Special functions
 * Random nnumbers