There are many alternatives to Google Home for Windows if you are looking for a replacement. The best Windows alternative is Home-Assistant.io, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Google Home and 12 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Google Home are openHAB (Free, Open Source), ioBroker (Free, Open Source), MediaPortal (Free, Open Source) and Domoticz (Free, Open Source).
ioBroker is an integration platform for the Internet of Things, focused on Smart home, Building Automation, Smart Metering, Ambient Assisted Living, Process Automation, Visualization and Data Logging. It aims to be a possible replacement or extension for software like f.e.
Domoticz is a home automation system that lets you monitor and configure various devices like lights, switches, various sensors/meters like temperature, rain, wind, UV, electricity, gas, water and much more. Notifications/alerts can be sent to any mobile device.
Oblecto is a media server, similar to Plex, Emby, Netflix and others. It runs in the background on a home server to index your media such as movies and TV shows to make them searchable and streamable through a REST based interface.
Homebridge is a lightweight NodeJS server you can run on your network that emulates the iOS HomeKit API. It supports Plugins,community-contributed modules, that provide a basic bridge from HomeKit to various 3rd-party APIs of "smart home" devices.
Homify is an open-source smart-home platform running on PHP using the Laravel framework. The entire application is built using a modular approach so support for other devices or actions can be implemented easily.
Control4 manufactures a complete line of affordable wired and wireless smart home systems and home automation software products to enable lighting control, temperature control, whole home audio distribution, security and energy management for homes.