I was struggling to find a good, lightweight (zero install, no runtime libraries etc needed) MQTT client for Windows to display toast notifications.
Here’s my first attempt:
MQTTNotifier (GitHub)
Automated build available on the Releases page.
I’m aware of HASS.Agent (depends on a Home Assistant integration and another Python project (but I didn’t want to install Python). Also I didn’t need/want the sensors etc from HASS.Agent.
If there’s enough demand, I’m happy to extend it with more features (e.g. images, action buttons)