The AROS Research Operating System is an effort to implement an Open Source and portable operating system that is compatible with AmigaOS(TM). Originally, it was meant as a direct reimplementation, but already has features not existing in AmigaOS.
MuOS is a Operating System for x86-compatible hardware.
malloc like shared memory library based on mapped file. Mapped on same virtual address for all members of shared arena, so allowing pointers into the shared space.