Lites

Lites was a Unix-like operating system, based on 4.4BSD and the Mach microkernel. Specifically, Lites was a multi-threaded server and emulation library that provided unix functionality to a Mach based system. At the time of its release Lites provided binary compatibility with 4.4BSD, NetBSD, FreeBSD, 386BSD, UX (4.3BSD) and Linux.