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freeware    

Arbitrary N FFT C-source
Here you will find mixfft05.zip, a package comprising the C-source for a very fast arbitrary N FFT routine as well as a benchmark program demonstrating the numerical capabilities and the performance of the routine. The file mixfft05.zip (41 kB) is available : from my home page
preview: http://hjem.get2net.dk  

freeware    

Digital Signal Analysis Software
This page provides FREE DSP software designed by the creator of the web site. Available tools that run under Windows include an FFT analyzer, a wavelet analyzer, and more. The site even allows you to try the software online in Java applet form before you download it.
preview: http://heliso.tripod.com  

freeware    

FFT Spectrum Analyser (arbitrary waveform function)
This JAVA applet, which works together with JavaScript, allows you to view the FFT spectrum of a specified input signal. Although it limits the input signal to be described by a combination of mathematical expressions of a few waveforms, you can still have fun seeing the output of the FFT.
preview: http://www.dsptutor.freeuk.com  

freeware    

FFTW (Fastest Fourier Transform in the West) Home Page
FFTW is a C subroutine library, available for FREE, for computing the Discrete Fourier Transform (DFT) in one or more dimensions, of both real and complex data, and of arbitrary input size. The web site includes download information, documentation, upgrade information, and related links. Further, the authors provide benchmark results of their routines.
preview: http://www.fftw.org  

shareware    

ScopeDSP Download (Shareware)
ScopeDSP can generate, read, write, window, and plot sampled-data signals. Its Arbitrary-N FFT algorithm performs Time-Frequency conversion. Many statistics in Time and Frequency can be calculated. ScopeDSP is shareware. You may use its Trial Edition free for 60 days, but you must Register the Professional or Student Edition with Iowegian International Corporation to use it beyond the Trial period.
preview: http://www.iowegian.com