GNU Radio is afree softwaredevelopmenttoolkit thatprovides signalprocessingblocks toimplementsoftware-definedradios andsignal-processingsystems. It canbe used withexternal RFhardware tocreatesoftware-definedradios, orwithouthardware in asimulation-likeenvironment. Itis widely usedin hobbyist,academic, andcommercialenvironments tosupport bothwirelesscommunicationsresearch andreal-worldradio systems.
QRadioLink is aLinux softwaredefined radiotransceiverapplicationusing VOIP forinter-communication,built on top ofGNU radio,which allowsexperimentingwith softwaredefined radiohardware usingdifferentdigital andanalog radiosignals and afriendly userinterface. Itsprimary purposeis educational,but it can alsobe customizedfor low powerdatacommunicationson variousfrequencybands. It canalso be used asan amateurradio SDRtransceiver fordemonstratingradiocommunications