Hardware used:
USB NooElec NESDR SMART.
Software used:
Gqrx
SDR# (Windows SDR software, actually decent)
GNU Radio Companion
rtl_433 (scans “433” devices such as weather sensors, various car sensors like tire and engine management)
gr-gsm (with Wireshark to scan mobile phone GSM packets)
Common frequency ranges:
Some SDR frequencies I’ve stumbled on locally: