HASS.Agent is open-source, free, and besides presenting sensors to Home Assistant, it also supports commands, notifications, and quick actions.
I introduce you to my favourite integration of Windows with Home Assistant: System Bridge. This app sends notifications, commands, and gathers data.
To celebrate HA Menu becoming available on Windows, I will be showing you how to set it up and, once the setup is complete, how to use it.
HASS Workstation Service is a new application which allows you to control and monitor your Windows PC from Home Assistant using MQTT.
Home Assistant Desktop is a small open-source application built with Electron. It is compatible with Windows, macOS, and Linux
There is a way to integrate your Windows PC with Home Assistant using the application IOT Link.