maybe not specifically relevant to your use case, but one excellent open source program for ham radio sdr stuff that i have found is linrad. it's got a bit of a learning curve, and is pretty fun once you get the hang of it. the author is very interesting, and has a youtube channel with lots of info on linrad and other ham radio projects.

http://www.sm5bsz.com/linuxdsp/linrad.htm

https://www.youtube.com/channel/UClmNy6VRE1YqOeBHwb3o0Yg/vid...