Some time ago (2014) I played around with the SDR reception using a DVB-T stick. The SDR# program is ideal for this. The program was at this time still open source software, so that you were able to understand the program to write your own plugins. Two plugins are available from this time

Easyscanner is a plugin for the SDR# programm to scan frequencies according to a list. It has a few settings, e.g. to set the scan intervall and release time and trigger level.

Levelmeter is a plugin for the SDR# programm

There are three modes to monitor the rx power rx power of VFO frequency (mode 0) average rx power in Bandwith (mode 1) peak rx power in Bandwith (mode 2)