Download of rtlsdr_scanner-setup-win32.exe (rtlsdr_scanner-setup-win32.exe ( external link: SF.net): 219,849 bytes) will begin shortly. If not so, click link on the left.
A cross platform Python frequency scanning GUI for USB TV dongles, using the OsmoSDR rtl-sdr library.
In other words a cheap, simple Spectrum Analyser.
More information can be found at:
http://eartoearoak.com/software/rtlsdr-scanner
Sources are available on GitHub:
https://github.com/EarToEarOak/RTLSDR-Scanner