Can you give extra context? It's unclear to me how Zephyr relates other than being an operating system. It doesn't on initial look seem to be designed with the same goals as Fuchsia.

This is an OS which can be used to create IOT devices - it works on many devices and architectures without binary blobs other than some firmware for stuff like BLE or WiFi.

"Fuchsia is an open source effort to create a production-grade operating system that prioritizes security, updatability, and performance. Fuchsia is a foundation for developers to create long-lasting products and experiences across a broad range of devices."

"The Zephyr ProjectTM strives to deliver the best-in-class RTOS for connected resource-constrained devices, built to be secure and safe."

This sounds a lot like the same to me - Fuchsia is perhaps more a general OS, but I would think that Zephyr can solve the same problems as Fuchsia.

What I like about Zephyr is that it is developed in the open and not in some google lab.