Software Defined Radio Resources

How SDR Radio Works from W9OY Blog

Commercial SDR Radios

Flex Radio – SDR based Ham Radio Transceivers
Perseus – HF SDR receivers
RF Space – HF SDR receivers
Quicksilver QS1R – HF SDR receiver
WinRadio – HF and VHF / UHF SDR receivers
Alinco – HF and VHF / UHF receivers with IQ outputs
Elecraft – KX3  HF Transceiver with IQ output (Coming this fall)
FUNcube Dongle – Wideband VHF / UHF receiver

Current SDR Radio Kits

SDR Cube – HF SDR Transceiver
GenesisRadio – HF SDR Receiver and HF Transceiver kits
SoftRock – HF SDR Receivers and Transceivers
Lazy Dog Engineering – SDR HF Receivers

SDR Software

PowerSDR – Works with SoftRock and Flex Radio hardware for Windows
Winrad – Supports several SDR radios for Windows
Linrad – SDR software for Linux and Windows
KGKSDR – SDR software for Windows
Rocky – SDR software for Windows
HDSDR – SDR software for Windows (supports the FUNcube Dongle)
MACSDR – SDR software for Macintosh
iSDR – SDR software for iPad and iPhone

D-Star Resources

D-StarUsers.org – Repeater Listings, Last Heard, etc
D-Star Gateway Status Page – Shows current status of D-Star gateways
D-Star Home – General info and repeater listings
Reflector List – List and Status
D-Star Tutorial – Good simple tutorial

Raspberry Pi

Raspberry Pi – Main Site
Wiki 

RTL2832U SDR

OsmoSDR – General Project Info
HDSDR – SDR Software Supporting RTL2832U DVB-T Sticks
SDR# –  SDR Software Supporting RTL2832U DVB-T Sticks
GNU Radio –  Linux SDR Software Supporting RTL2832U DVB-T Sticks