Looking for Room Measurement / Speaker Setup Software

I’ve gotten to the point where I am happy with the equipment I have (PS Audio Digital / VPI Super Scoutmaster Reference, NAT Preamp, Maker Audio Amp, Hansen Prince speakers), but I know the speakers could be better optimized. The setup is in a crappy room (too open, with a big couch) but it still sounds really good. Not great though.

Can anyone recommend software / hardware that I can by to measure frequency response at my listening position that I can use to adjust speaker placement? If I need separate hardware above & beyond my laptop that’s fine, though obviously something that works with the laptop’s hardware is more economical. I’m guessing we’re talking a good USB mic and some software but I have no idea what to get.

Thanks!

Ian     Palm Beach County, Florida