Some examples:
- Android
- Alpine: Alpine Linux is built around musl libc and busybox
- glaucus: A simple and lightweight Linux distribution based on musl libc and toybox
- Chimera (alpha stage): Chimera uses a novel combination of core tools from FreeBSD, the LLVM toolchain, and the Musl C library
Also, Unix ≠ Linux.
It’s only called UNIX if it comes from the Santa Cruz region of California, otherwise it’s a sparkling POSIX.