After spending a lot of time searching for this, I thought that some Super User gurus might know the answer. I'm searching for an open source application to compute a FFT, that could:

- Import a list of points from a text file (in any format; I could write conversion scripts if needed), for example
`0,1; 1,2; 4,5`

- Compute the associated discrete transform, and output the list of coefficients

Ideally, it would also display the plot and the associated fourier decomposition on the same graph, to allow comparison, but this is not absolutely needed.

It can be either on Windows or on Linux/UNIX.

Can you think of a solution?