The core principle is simple: a non-HomeKit device can be added to Apple Home only if it has a supported plugin, integration, API, hub, Matter bridge, or some indirect control method. If the device is completely closed, no API, no third-party control, no plugin, it can't be bridged no matter what software you use.

For most people, Homebridge is the starting point. It's an open-source Node.js server that runs locally on your network and presents non-certified devices to the Home app as if they were native accessories. The plugin library is genuinely large Eufy cameras, Xiaomi robot vacuums, Tuya-based smart plugs, Nest thermostats, LIFX bulbs, Broadlink IR blasters, and hundreds more.

Here's what nobody tells you before you start:

1. The mDNS problem will eat your afternoon.
   If you're running Homebridge in Docker with the default bridge network, multicast traffic is silently blocked. iOS never sees the accessory. The Home app shows nothing. No error, no log entry just absence. You need host networking or macvlan.

2. Zigbee and Z-Wave devices need their own hubs.
   A Raspberry Pi running Homebridge won't magically make Zigbee devices work. They need a Zigbee coordinator (like a Conbee II or Hubitat) or a bridge that speaks their protocol.

3. Once it works, don't touch it.
   The most common advice from long-term users: "Once it is stable I just don't bother with updates. I have to reboot the system maybe once every six months". Every major iOS update is a gamble.

4. Matter is changing the game slowly.
   Some newer devices now support Matter natively, which means direct integration without a bridge. But "Matter-compatible" doesn't always mean what you think, especially with Thread devices across multiple ecosystems.

My verdict: Homebridge is the path of least resistance for most non-native devices. But go in knowing you're building a small server that needs maintenance, not installing a plug-and-play solution. The community plugins are your lifeline stick to ones with high download counts and recent update dates