The Ecobee3 Lite works with HomeKit, so you can control your heating and cooling from Apple's Home app for iOS -- or with Siri.

Belkin's WeMo Bridge makes your existing WeMo devices HomeKit-enabled. 

Ask Siri to pull up your Omna cam's live video feed.

Control August's Bluetooth- and Wi-Fi-enabled (Wi-Fi with Connect accessory) Smart Lock Pro with Siri, Alexa or Google Assistant. 

Add the Beddi Smart Alarm Clock to an Apple HomeKit scene for multi-device automation.

Use Apple's HomePod to control HomeKit smart home gadgets. 

Elgato's Eve Degree temperature, humidity and air quality sensor works with HomeKit, too.

The Belkin WeMo dimmable switch responds to Siri voice commands.

Ask Siri if there's a leak in your house using Fibaro's Flood Sensor.

Use Siri and the Home app to monitor and control Elgato's Eve Energy.

Honeywell's Lyric T5 works with a variety of smart home partners, including Apple HomeKit. Just ask Siri to change the temperature for you.

Check on the status of your Chamberlain Smart Garage Hub with Siri.

You could also check out the new version of the Philips Hue Bridge, which adds HomeKit support to an already well-developed smart lighting platform.

Control Carrier's Cor 5C thermostat from the iOS Home app or Siri.

You can also keep tabs on the conditions in your home using the Elgato Eve Room sensor, which monitors temperature, humidity and air quality. If you want to take a look at any of those metrics, just ask Siri.

Turn on presets for your Nanoleaf Aurora LED Light Panels (with Rhythm accessory) using Siri on your iOS device -- or on the HomePod. 

The Ecobee4 Smart Thermostat has a built-in Alexa speaker, but it also works with Siri and the Home app. 

Smart switches make it easy to automate anything with a plug in it, and with a HomeKit-compatible switch, like this one from iDevices, you'll be able to turn stuff on and off just by asking Siri.

iDevices also makes an outdoor version of the switch that does the same thing -- perfect for automating your holiday lighting.

This HomeKit-compatible smart plug from iHome isn't quite as fully featured as the iDevices Switch, but it costs a little less.

Insteon offers a HomeKit-compatible version of its hub -- hook it up with your router and you'll be able to automate Insteon's switches, sockets and light bulbs right alongside any other HomeKit gadgets you've got installed.

Another lighting option is this HomeKit-compatible kit from Lutron, which comes with two smart plugs that you can plug lamps into, and two remotes. Hook everything up and you'll be able to tell Siri to dim the lights.

Install Schlage's HomeKit-compatible smart deadbolt and you'll be able to lock and unlock it with a quick word with Siri.

The Honeywell Lyric Thermostat (second-generation) also works with Apple's HomeKit platform.

Control your Lifx Mini Wi-Fi Smart Bulbs using Siri -- or the Home app. 

Control Hunter's smart ceiling fans via Siri voice commands.