Apps similar to GNU Radio include Gqrx, which is free and open source. Other options are Simulink, Universal Radio Hacker, SigDigger and CubicSDR. You can choose from more than 10 Software Frameworks like GNU Radio for Linux, Mac, Windows and Android.
LuaRadio is a lightweight, embeddable flow graph signal processing framework for software-defined radio. It provides a suite of source, sink, and processing blocks, with a simple API for defining flow graphs, running flow graphs, creating blocks, and creating data types.
SoapySDR is an open-source generalized C/C++ API and runtime library for interfacing with SDR devices. With SoapySDR, you can instantiate, configure, and stream with an SDR device in a variety of environments. Both osmosdr and uhd devices are available within SoapySDR.
Multi Physical Nexus is a new software that allows the user to create visual diagram and print charts or export data in files. It is already well working, but it is still under developpement and does not include all the simulink features.
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