#gqrx is not quite as polished as #SDRsharp on Windows but it reads my Discover HF+ just fine, and can be controlled by #WSJTX. It took me a while to get the settings right.
And unfortunately it's set up right now using my nice studio audio interface to pipe audio from one to the other. Once I switch it to something else, I can have this decoding full time in the background and still play games and do music and whatnot.