Universal Radio Hacker has been discontinued. Similar apps include GNU Radio, which is free and open source. Other options are inspectrum and Baudline. In total there are three apps like Universal Radio Hacker for Linux, Mac and Windows.
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...
inspectrum is a tool for analysing captured signals, primarily from software-defined radio receivers.
Baudline is a time-frequency browser designed for scientific visualization of the spectral domain. Signal analysis is performed by Fourier, correlation, and raster transforms that create colorful spectrograms with vibrant detail.
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