As the website states, CATSync is a tool that allows you to synchronise public WebSDR receivers with your real rig connected via CAT control to your computer. It supports the classical WebSDR, Kiwi SDR as well as Open Web RX.
As I have reiterated, there are some great developers out there that have contributed to AR in many different way, and software is one of them. I haven't tried this program yet but I will, as I am still working on the CW and this would allow me to use a remote receiver to receive some of the signals that are down in the noise from my home QTH and even compare them. Whilst I would also be able to send CW from the attached rig. Synchronising the two receivers would provide an extra string to the bow.
I'll post an update, when I've given it a workout.