Checkout https://phoscon.de/en/conbee2 You can control a wide range of Zigbee devices without installing a gateway. From Philips Hue or Ikea lamps to plant sensors from Aliexpress.
List of supported devices: https://github.com/dresden-elektronik/deconz-rest-plugin/wik...
You would integrate the devices with an OpenSource HomeKit or HomeBridge implementation on a Raspberry or similar into your home.