I wanted to see what HomeBridge could do and only had a light so I created a plugin https://www.npmjs.com/package/homebridge-cmd4
that lets you virtualize almost all devices in HomeKit so you can try HomeKit without having any devices at all. This may help some people. You still need a Raspberry Pi or other device to run HomeBridge on, but at least you can try HomeKit out and see what it has to offer..
May I also suggest you try the Eve App, instead of HomeKit. It is better visually and a little more advanced at this time than HomeKit is.