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).
VS
Vendefoul Wolf
Vendefoul Wolf is a set of lightweight, Devuan-based Linux distributions featuring various popular desktop environments, including Budgie, Cinnamon, KDE Plasma, LXQt, Trinity and Xfce. As the init software, it offers a choice between SysV and runit.