Zig's is in the standard library. From the commits it was started by Joran from Tigerbeetle, and now maintained by mlugg who is a very talented zig programmer.
The popular Rust one is tokio's io-uring crate which
1) relies on libc; the zig one just uses their own stdlib which wraps syscalls
2) Requires all sorts of glue between safe and unsafe rust.
