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Libc
Musl - A lightweight, fast, simple, and standards-compliant C library implementation. It aims to be correct in terms of standards-conformance and safety.
BSD libc - A family of C standard library implementations used in various BSD operating systems, such as FreeBSD, NetBSD, and OpenBSD.
PDCLib - A public domain C library implementation that aims to be minimal, portable, and conformant to C standards.