Gqrx SDR – Open source software defined radio by Alexandru Csete OZ9AEC
Amazon.com: Nooelec NESDR Smart HF Bundle: 100kHz-1.7GHz Software Defined Radio Set for HF/UHF/VHF Including RTL-SDR, Assembled Ham It Up Upconverter, Balun, Adapters : Electronics
The Fundamentals of Software-Defined Radio | DigiKey
SdrDx – Software Defined Radio (SDR) App for Mac OS X | RadioHobbyist.org
Best SDRs with Antenna
The BIG List of RTL-SDR Supported Software
Properly Adjust Your SDR Software Waterfall - Fauquier Amateur Radio Association