Not a real repo, but if you want to ask me a question I may be able to help with, just log an issue here. That way others can see the answers as well.
Below are some links and sources of things that I have found useful for getting me going with home automation.
Andreas has some great run throughs of various bits of hardware, and goes through the pro's and con's of of the bit and bobs he's interested in: https://www.youtube.com/channel/UCu7_D0o48KbfhpEohoP7YSQ
This is the central server I use for connecting all my things. Built on MQTT, I found that there are adaptors for most things to connect to MQTT: https://mosquitto.org/
When building an automation system, I found this to be the central "hub" for everything after experimenting with several things.
An automation platform, with apps for various devices, and a great way to get a UI on top of things. A fairly steep learning curve, but a heap of integrations for many different things. I started with this as the central server over MQTT, however found MQTT easier in the end, and connect openHAB to MQTT for integration with the various devices. This means a bit of double handling, but it works for me.
How I connect my Apple HomeKit to everything. Using the HomeKit to MQTT bridge I can ask Siri to "open the blinds" etc. I would recommend running this is Docker if it's an option in your environment as there are a bunch of dependancies. https://github.com/hobbyquaker/homekit2mqtt