Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
Apple HomePod - The new home entertainment system by Apple
Tmall Genie - Alibaba's Echo-like smart speaker competitor
Sonos One - A self-contained, Alexa-connected speaker from Sonos
Voice in a Can - A standalone Alexa app for the Apple Watch and Galaxy Watch
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.