FFTW is available under two distinct licensing options:
1. Commercial License Options and Pricing
2. Free Open Source License
You are free to redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.
"FFTW" stands for "Fastest Fourier Transform in the West." FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data, as well as of even/odd data, i.e., the discrete cosine/sine transforms, or DCT/DST.
FFTW’s speed is superior when compared to other publicly-available DFT programs and its performance is highly competitive with that of vendor-driven solutions. FFTW is also portable, so it will work well on most architectures without modification – something vendor-driven custom applications cannot match.
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