SigDigger

SigDigger is a Qt5‑based digital signal analyzer written in C/C++ that runs on GNU/Linux, macOS and Windows. It relies on its own DSP library (sigutils) and a real‑time analysis library (Suscan) rather than GNU Radio, and it uses SoapySDR to support most SDR hardware. The software is released under GPL‑3.0 and can be built from source or obtained as pre‑compiled binaries.

The application offers an OpenGL‑enhanced spectrum and waterfall view, with both real‑time and replay analysis modes. Users can listen to analog audio (AM, FM, LSB, USB), record baseband data, and perform a range of measurements such as SNR calculation, cyclostationary analysis, and Doppler tracking. Additional tools include symbol recording, burst detection, limited off‑line demodulation, and network broadcasting of demodulated data.

Targeted at hobbyists, amateur radio operators, and researchers working with software‑defined radio, SigDigger provides features like dynamic spectrum browsing, blind parameter estimation, bandplan overlay, and a panoramic spectrum interface, all while leveraging multicore CPUs for parallel processing.