SmartOS
SmartOS is an open-source UNIX-like operating system based on illumos, a community fork of OpenSolaris. It features four technologies - ZFS (a combined file system and logical volume manager), DTrace (a dynamic tracing framework for troubleshooting kernel and application problems), Zones (a lightweight virtualisation solution), KVM and bhyve (two full virtualisation solutions for running a variety of guest operating systems, including Linux, Windows, BSD and Plan9).
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ArchBANG Linux
ArchBang Linux is a lightweight distribution based on Arch Linux. Using the labwc Wayland compositor, it is fast, up-to-date and suitable for both desktop and portable systems.