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There are two known open source operating systems that mimic the look and feel of Mac OS that were derived from FreeBSD. The Operating Systems airyxOS and helloSystem copy the look and feel of OS X. Although they are not the only Mac OS X clones out there they are mentioned here because they are FreeBSD. Apple's Mac OS X is built from 4.4BSD-Lite2 and FreeBSD. However, OS X is not FreeBSD and shares little with FreeBSD in its present state. OS X may still have FreeBSD's virtual file system, and network stack which will likely and inevitably be replaced at some point after this writing but this is not for certain. There are two known open source operating systems that mimic the look and feel of Mac OS that are developed from FreeBSD. The Operating Systems airyxOS and helloSystem copy the look and feel of OS X. Although they are not the only Mac OS X clones out there they are mentioned here because they are FreeBSD. Apple's Mac OS X is built from 4.4BSD-Lite2 and FreeBSD. However, OS X is not FreeBSD and shares little with FreeBSD in its present state. OS X may still have FreeBSD's virtual file system, and network stack which will likely and inevitably be replaced at some point after this writing but this is not for certain.