If you just want to try out Node-Red, I assembled an Image that targets Hubitat users. It's got all the components you'll need, to get a flow or two working.
Raspberry PI Image for Homebridge + Node-Red
It's a year or so old so every module would be due for an upgrade I suspect. I wouldn't make that the first step though because that image will give you an excellent feel for what Node-Red is. If you find it fits, then you may want to make a "real install" on the computer of your choice. It's rather light-weight resource wise and it simply requires NodeJS to be installed... which the installer script will do for you. But that's the prerequisite -- NodeJS can be installed.
