FFTPACK

FFTPACK is a package of Fortran subroutines for the fast Fourier transform. It includes complex, real, sine, cosine, and quarter-wave transforms. It was developed by Paul Swarztrauber of the National Center for Atmospheric Research, and is included in the general-purpose mathematical library SLATEC.

Much of the package is also available in C and Java translations.

• Fastest Fourier Transform in the West (FFTW)
• LAPACK
• List of open-source mathematical libraries

• Official website
• Swarztrauber, P.N. (1982). "Vectorizing the FFTs". In Rodrigue, Garry (ed.). Parallel Computations. Academic Press. pp.51–83. ISBN 978-0-12-592101-5.
• Wendykie, Piotr. "JTransforms". Java. Open source. Multithreaded FFT library