SigDigger has your typical AM/FM/LSB/USB demodulation and audio
playback features. However, it also has some key additional
features that make it worth taking a look at if you're interested
in reverse engineering, or taking a closer look at digital signals.

The features include:
* Both realtime and replay analysis modes
* Analog audio playback (AM, FM, LSB and USB)
* Baseband recording (full spectrum and per-channel)
* Per-device gain presents
* Dynamic spectrum browsing
* ASK, FSK and PSK inspection
* Gradient-descent SNR calculation
* Different spectrum sources (cyclostarionary analysis, signal power…)
* Symbol recording and visualization
* Transition analysis