Homebridge allows you to integrate with smart home devices that do not natively support HomeKit. There are over 2,000 Homebridge plugins supporting thousands of different smart accessories.
Some of the most popular plugins include:
Ring
Nest & Nest Cameras
TP-Link Kasa Smart Home
Hue / deCONZ (Zigbee)
Belkin Wemo
myQ
UniFi Protect