Another free app I wrote...
This app makes an RTL SDR dongle appear as a networked SDR, emulating the RF Space protocol. It works with SDR apps such as SdrDx.
CocoaRTLServer requires that rtl_tcp (part of RTL-SDR) be installed and running. rtl_tcp performs the actual interfacing to the RTL tuner, and serves I/Q data to CocoaRTLServer. If you have an RTL dongle, chances are you already have RTL-SDR.
Please note that I cannot provide any support for installing or using RTL-SDR.Program page:
http://www.blackcatsystems.com/software/cocoa_rtl_server.html