Alpine Linux
Alpine Linux is a community developed operating system designed for routers, firewalls, VPNs, VoIP boxes, containers, and servers. It was designed with security in mind; it has proactive security features like PaX and SSP that prevent security holes in the software to be exploited.
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GhostBSD
GhostBSD is a user-friendly desktop operating system based on FreeBSD. Its default desktop is MATE, but a separate community edition with Xfce is available too.