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.

https://ziglang.org/documentation/master/std/#std.os.linux.I...

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.

github.com/tokio-rs/io-uring