For Mac users - a new webcam app.
I'm adding this to existing 'webcam' questions for future searchers.
I am in no way affiliated with this product or the company making it - this is a simple user to user recommendation.
I just discovered this today, announced on DPReview a new product called Cascable Pro Webcam £40 [£30 for the first week to 24 July 2020]
I've just tried the demo & it "just worked".
I've never had anything before on Mac that could do this with my D5500, so I thought I should let others know about it.
The app runs you through a setup procedure, including asking if you want to connect over WiFi or USB. I went with USB for my Nikon D5500.
Switch camera off, connect to USB, switch on - camera is discovered & set up automatically. It then asks if it can install a plugin to add it as an input option on any camera-capable app.
Done, that's it.
Here's their list of compatible cameras