Is this related to zigpy-spinel and/or ziggurat projects puddly been working on?

[Hedda]

Is this zigbee-on-host project related to the zigpy-spinel and/or ziggurat projects that has puddly been working on?

• https://github.com/puddly/zigpy-spinel

Quote from README.md

zigpy-spinel

This is an experimental software Zigbee stack implemented in Python, using OpenThread RCP as the radio frontend.
A subset of 802.15.4 and the Zigbee APS and NWK layers are implemented.

ziggurat

This is an even more experimental Zigbee stack implemented in Rust, aiming to emulate a traditional Zigbee coordinator serial interface to be drop-in compatible with existing Zigbee software.

[Nerivec]

It is in the same line of work to "open source ZigBee".