HomeAssistant, it's such an awesome Tool.
You want to combine your plant sensors with air quality sensors and an plant light? Easily done.
You want to forward your mastodon follower count to an mqtt-LED-Pixel-Clock? No problem.
My favorite thing I've done with hass is put a color-changing light bulb by my front door. It's connected to the weather forecast. I know what the weather will be at a glance without a website or going outside. (Where I live, it's not always obvious when I'm gonna get rained on.)
Pretty cool, I use it as well. Works with basically everything thanks to the big community.
I just wish it allowed for proper programming of the automations. I despise the YAML-as-code hack they are using. I get it, it's much easier to offer a GUI editor for such a format.
It feels very limited and cumbersome compared to regular programming though.