I think matlab does it. Just read in the file, and plot it.
Otherwise, if you can find a copy, then Cool Edit will do it. It can display the .wav file graphically, and it can save it as a raw PCM (e.g. 16-bit, or 8-bit
A/u-Law) without the .wav header too. However, the software is no longer developed, and Adobe Audition was the replacement (but I've
never tried Audition, and I don't know if it is suitable).
yes CoolEdit very cool! I download CoolEdit 2000 v1.1 but it is only for trial period of use!
And I think matlab is also non free tool! But I see many responsis/questions/answers on this forum...
p.s.
I need manipulation only on few seconds or milisecounds of sounds (edit, merge, edit left and right of stereo channels)
I use it for preparing digitized speech samples before storing them in ROM because it can handle non-standard PCM rates. It's a useful tool and most of it's functions are free, there is a small charge to unlock the remaining functions. Alternatively, Audacity might be able to do your job.