Where to find the needed software for Z-Stack Linux Gateway?

Hello. I'm trying to make a coordinator gateway in order to connect a Zigbee network on the cloud.

I was searching for an alternative to Zigbee2mqtt, which i find hard to customize in relation to my custom devices' firmware (for the coordinator i'm using the standard ZNP project, for the others i'm developing a custom firmware based on zr_genericapp). I found this page on Z-Stack Linux Gateway, which seems perfectly suitable for my needs, i'd like to run it on a linux board like a Raspberry Pi or on a desktop computer, but i could not find the needed software anywhere!

Please, any advice would be very appreciated.

Thank you in advance.

Roberto