Bodhi Linux
Bodhi Linux is an elegant and lightweight Debian/Ubuntu-based distribution featuring Moksha, an Enlightenment-17-based desktop environment. The project takes a decidedly minimalist approach by offering modularity, high levels of customisation, and choice of themes.
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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).