LIFX is supported. I dont think there is a Nanoleaf Wifi integration that I have seen, but if yours support Matter that could be an option.
All the Zigbee stuff and shelly should work. Some non-standard Zigbee devices have quirks.
Found this on the Flic buttons: Adding a Flic bluetooth button via Maker API [tutorial]
If it connects to Wifi and is HK compatible, you wont be able to easily (if at all) get any info from it into HE. Same goes with any cameras. There is not much to get into the HE anyway, just motion alerts if you want to have lights come on or something. You might want to look into https://www.scrypted.app/, I have checked it out quite a bit but have not gotten around to setting it up yet. I just have a Ring doorbell and two Wyze cams.
Again, if it is Wifi and integrates directly to Apple HK then you possibly wont be able to connect it to HE very easily.
This would be cloud based and I don't think there is a direct integration. You might be able to bring them in by connecting it to the SmartThings cloud (possibly no hub needed) and using HubiThings [RELEASE] HubiThings Replica - #216 by steinauf
