bhyve, the "BSD hypervisor", pronounced "beehive" is a hypervisor/virtual machine manager available on FreeBSD and illumos.

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A simple, elegant desktop BSD Operating System.

GhostBSD provides a simple desktop-oriented operating system based on FreeBSD with MATE and OS packages for simplicity. In addition, GhostBSD has a selection of commonly used software preinstalled to make it easy on your computing journey.

A simple, elegant desktop BSD Operating System

Bastille is an open-source system for automating deployment and management of containerized applications on FreeBSD.

Bitrig is a free, fast, and secure Unix-like Open Source operating system. It is available on current hardware platforms. The source code is freely available under a permissive license.

pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router. In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution. pfSense is a popular project with more than 1 million downloads since its inception, and proven in countless installations ranging from small home networks protecting a PC and an Xbox to large corporations, universities and other organizations protecting thousands of network devices.