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What is GNU Radio?

https://www.gnuradio.org/about/

GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios.
It can be used with readily-available low-cost external RF hardware to create software-defined radios, or without hardware in a simulation-like environment.
It is widely used in research, industry, academia, government, and hobbyist environments to support both wireless communications research and real-world radio systems