[antoncohen]

The OS Fuchsia, including the kernel Magenta, appears to be open source, mostly under BSD 3-clause, with parts of the kernel under MIT and similar licenses.

https://fuchsia.googlesource.com/fuchsia/+/master/LICENSE

https://fuchsia.googlesource.com/magenta/+/master/LICENSE

https://fuchsia.googlesource.com/