The sdr (software design radio) is brought by wondefull plaform softrock, soft66 or genesis. If you allready check the www.websdr.org, made by PA3FWM you see the powerfull tool, now I sugest to test the software so2sdr.
so2sdr is contest log program that features a software-defined radio (SDR) bandscope. The program is written using Qt and is dual-platform, running in Linux and Windows.
Two-radio (SO2R) support. Headphone and radio switching via parallel por
Uses hamlib for radio communications
Currently supports soundcard based SDR interfaces (Softrock, etc).
Requires 96 KHz stereo soundcard
CW generation via Winkey
Project home http://code.google.com/p/so2sdr/