Fortran codes for the Fast Fourier Transform. 1. Romo's Free Software - OFFT, "Outrageously Fast Fortran Transpose", and BFFFT, "Blazingly Fast FFT, 2-Dimensional Vectorized Fast Fourier Transform" written in Fortran 90. 2. A Short Demonstration Version of the FFT - Source code of a subroutine to transform (forward or inverse) a one-dimensional complex array in place. 3. CHIRP-Z transform for FFTs - Little known algorithm for calculating the FFT of a series of any length. Based upon Applied Statistics algorithms 117 & 83. 4. Ernst Mayer - Fortran 90 codes for Fast Fourier Transforms and Discrete Weighted Transforms, for use in number theory research. 5. Fast Fourier Transform code - By James Van Buskirk. 6. FFTPK90 - Translation of fftpack and vfftpk to Fortran 95 by Simon Clarke. 7. Jörgs Useful and Ugly FFT page - Code and links in Fortran and C for the Fast Fourier Transform. 8. Pipelined phase-rotation FFT - By David O'Halloran. The Welchel phase-rotation FFT is a new form of the fast Fourier transform (FFT) that replaces data movement at runtime with equivalent multiplications by precomputed constants. The result is an FFT that is easy to pipeline.

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