Not if you use it to develop commercial applications, but free otherwise, see link below:
 
http://www.codesourcery.com/vsiplplusplus/1.4/download.html
 

Certain versions of Sourcery VSIPL++ and Sourcery VSIPL, licensed under the GNU Public License, are available for free download.



On Wed, Oct 22, 2008 at 1:52 PM, Peng Yu <pengyu.ut@gmail.com> wrote:
On Wed, Oct 22, 2008 at 1:56 AM, Paul Baxter <pauljbaxter@hotmail.com> wrote:
> From: "Peng Yu" <pengyu.ut@gmail.com>
>>
>> FFTW is the fastest FFT library. But its interface is in C. I'm
>> wondering if there is any ongoing project on FFT.
>
> You could try VSIPL++ at www.codesourcery.com

If I'm correct, VSIPL is not free, right?

Thanks,
Peng
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Zoltan