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WNLIB C Subroutine Library
Will Naylor's free, unrestricted ANSI-C subroutine library including numerical routines such as conjugate-gradient and conjugate-directions, simplex method, transportation problem, fast-Fourier transform, matrix and vector operations.

Addix.Spline
A comprehensive spline curve function library for creating and evaluating splines in Excel, VB and VBA. Free download of evaluation copy.

Freely Available Software for the Solution of Linear Algebra Problems
Software for high-performance computers available in source form for problems in numerical linear algebra, specifically dense, sparse direct and iterative systems and sparse iterative eigenvalue problems.

METIS: Serial Graph/Mesh Partitioning & Sparse Matrix Ordering
Graph, mesh, and hypergraph partitioning software. Free download, portable on most Unix systems that have an ANSI C compiler (e.g. GNU C).

Discrete Fourier Series Transform
Basic presentation of the discrete Fourier series transform. Explanations and formules. Raw source code to calculate numerical Fourier transforms.

Netlib
Searchable repository of free numerical software.

MAI Information Technology
Numerical, statistical, and signal processing subroutine libraries optimised for OS/2 platforms.

GNU Octave
Free numerical analysis and visualization environment similar to Matlab.

Newmat C++ Matrix Manipulation Library
For the manipulation of matrices in the C++ language, oriented towards science and engineering applications.

Ordinary Differential Equation System Solver
A Java-Applet/Application for solving ODE systems.

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