Yes, Domoticz [1] is specialised for that.

"Domoticz is a very light weight home automation system that lets you monitor and configure miscellaneous devices, including lights, switches, various sensors/meters like temperature, rainfall, wind, ultraviolet (UV) radiation, electricity usage/production, gas consumption, water consumption and many more. Notifications/alerts can be sent to any mobile device.

Best of all, Domoticz is open source and completely free! You only need to invest in hardware."

See their HCL here [2]

[1] https://www.domoticz.com/wiki/Main_Page

[2] https://www.domoticz.com/wiki/Hardware

I've often wondered why someone doesn't design a daughterboard with a SDR chip for the RPi as this would let them do away with the embedded cpu/FPGA.

Plunk an rtl-sdr chip on a RPi board and Bob's your uncle...

Perhaps the IO bandwidth between the RPi and its peripherals isn't high enough to enable it to manage an SDR. (I don't imagine you could connect a modern GPU, or a video capture device, to an RPi either.)

Speaking of: are there any SBCs that have PCIe-based daughterboard support? Or Thunderbolt-3-based peripheral support?

Those based on the Zynq-7000 line from Xilinx usually have ample IO, but start at about 100$, going up. You might need to do something in the FPGA part of them to use the IO though.

There are the RTL-SDR usb dongles. One I’m currently looking at is the dAISy board. Turns your Pi into a marine AIS receiver.