Zigbee compatible dingle or solution?

I want to use Zigbee because it is cheap.

I might use my old computer or the pi.

What options for Zigbee do I have? I hear all Zigbee options are not compatible unlike Zwave.

I would like a solution that works with other Foss platforms like openhab so that I have the option to switch if I don’t like hass

Also the option has to be easily available in India or internationally

You want the deCONZ component and a ConBee USB stick.