- FFTW
Free C FFT library including multi-dimensional, real, and parallel transforms.
www.fftw.org
- Web Directory: FFT Links
Descriptions of many FFT-related sites on the Web, with links.
www.fftw.org/links.html
- General Purpose FFT Package
C/Fortran code for the Discrete Fourier/Cosine/Sine Transform.
momonga.t.u-tokyo.ac.jp/~ooura/fft.html
- FFTPACK
Package of Fortran subprograms for the fast Fourier transform of periodic and other symmetric sequences.
www.netlib.org/fftpack/index.html
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