Free spectrum analyzer software

[EsaT]

What I've checked this looks very nice:
http://freenet-homepage.de/dl4yhf/spectra1.html

I found it while searching for Winamp spectrum analyzer plug-in because user in one forum took noise sample...
Here's what this program found from it:
http://img409.imageshack.us/my.php?imag ... 959or1.jpg
(nothing important at higher frequencies)