openHAB might be a bit more popular than Google Pixel Stand. We know about 1 link to it since March 2021 and only 1 link to Google Pixel Stand. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Pixel Stand (2nd Generation) - Seems to replace existing Https://store.google.com/product/pixel_stand. Source: over 2 years ago
You can start on a general home automation like openhab.org. Source: over 1 year ago
Google Home Hub - Control your connected home in one view
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Calaos - Open source home automation
ioBroker - flexible and modular application for the IoT and Smarthome
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.
Domoticz - Domoticz is a lightweight Home Automation System