Gqrx
Gqrx is a free, open source SDR receiver for listening to and exploring the radio spectrum, made for radio hobbyists on Linux, macOS and Windows.
Linux · macOS · Windows Open source
Telecom & VoIP apps
Software for voice over IP, mobile networks and software-defined radio: SIP servers, 4G and 5G cores, test tools and SDR receivers.
Gqrx
SigDigger
Free analyser for unknown radio signals with real-time demodulation, for radio amateurs and spectrum hobbyists, on Linux, Windows and macOS.
Linux · Windows · macOS Open source
GNU Radio
GNU Radio is a free signal processing toolkit for building software-defined radios, aimed at engineers and students, on Linux, Windows and macOS.
Linux · Windows · macOS Open source
SDR# (SDRSharp)
SDR# (SDRSharp) is Airspy’s free software radio receiver for listeners and radio amateurs who use SDR hardware, available for Windows only.
Windows Free
RTPEngine
RTPEngine relays, encrypts, records and transcodes the audio and video of SIP calls, aimed at VoIP carriers and WebRTC platforms on Linux.
Linux Open source
Yate
Yate is an open source C++ telephony engine bridging SIP, H.323, IAX, SS7 and ISDN, built for telecom engineers, running on Linux and Windows.
Linux · Windows Open source