Open Infrastructure Without Compromise
Karios BSD is a free and open-source virtualization platform developed by the Karios Foundation. Built on the proven technologies of FreeBSD, Bhyve, and ZFS, it provides a secure, high-performance operating system for hosting virtual machines and modern workloads without licensing restrictions, subscriptions, or proprietary lock-in.
Designed for developers, IT professionals, researchers, educators, home labs, and small-to-medium infrastructure deployments, Karios BSD delivers enterprise-grade capabilities in a streamlined platform that is simple to deploy, easy to manage, and permanently free.
Whether you are building a development lab, running production services, or learning virtualization, Karios BSD gives you complete control over your infrastructure.
Core Features
High-Performance Virtualization
Built around the native Bhyve hypervisor, Karios BSD provides fast, low-overhead virtualization for Linux, Windows, BSD, and other guest operating systems. Its lightweight architecture allows more hardware resources to be dedicated to workloads rather than the virtualization platform itself.
Enterprise Storage with ZFS
Karios BSD integrates the industry-leading ZFS file system, providing end-to-end data integrity, snapshots, cloning, compression, replication, and advanced storage management without requiring additional software.
Virtual Machines and Containers
Run traditional virtual machines and containerized applications on the same host, enabling development, testing, and production workloads from a single operating platform.
Integrated Web Management
A minimalist web interface provides centralized administration without sacrificing performance. Create and manage virtual machines, monitor system health, configure storage, administer networking, and perform day-to-day operations through an intuitive browser-based interface while maintaining an exceptionally small resource footprint.
Modern Networking
Create secure virtual networks using integrated virtual switching, VLANs, software-defined networking capabilities, and advanced networking features designed for modern infrastructure deployments.
Digital Sovereignty by Design
Karios BSD is built on the principle that infrastructure should belong to the people who operate it.
There are no license keys, subscription fees, activation servers, mandatory cloud accounts, telemetry requirements, or “phone-home” services.
Deploy Karios BSD on a single server, an isolated network, an edge location, or an entire development environment knowing that your infrastructure remains completely under your control.
Your systems, your data, your policies, your infrastructure.
Open Source Without Exceptions
Every line of Karios BSD is developed in the open and maintained in public repositories. There are no proprietary feature gates, delayed community releases, or restricted editions. The software available to the community is the same software developed by the Foundation.
The Karios Foundation also invests directly in the future of open infrastructure by contributing engineering resources upstream to the FreeBSD and Bhyve communities, helping strengthen the technologies that power Karios BSD and the broader open-source ecosystem.
Built for the Community
Karios BSD exists to make modern virtualization accessible to everyone. From students and researchers to developers, hobbyists, and organizations seeking an open alternative, the platform provides a stable foundation for innovation without commercial barriers.
By combining enterprise-grade virtualization, integrated storage, modern management, and complete digital sovereignty, Karios BSD delivers an open infrastructure platform that is designed to remain free, transparent, and community-driven for generations to come.
Need Commercial Options?
Karios BSD is a complete, unrestricted, and fully featured standalone hypervisor and host OS platform built for individual bare-metal nodes. It is developed openly, distributed under a permissive BSD license, and is free forever. It is the ultimate platform for enthusiasts, developers, home labs, and single-server production nodes.
Organizations that want the flexibility of Karios BSD but require corporate backing can purchase Paid Support and Professional Services directly from Karios.
Separately, Karios Core is available for those seeking an enterprise-class solution. Karios Core is an entirely different product and operating system model.
It is not an “upgrade” or a licensed unlock of Karios BSD. Instead, it is a commercial operating system engineered from the ground up for multi-node clustered environments – scaling easily from small 3-node clusters all the way up to thousands of nodes across multiple sites and regions.
It is purpose-built for organizations requiring a true, multi-tenant enterprise virtualization solution capable of securing complex modern workloads-such as high-density AI/ML training and inference infrastructures-across highly distributed physical architectures.
Why Keep Karios Core Separate from Karios BSD?
We hold open-source integrity close to our hearts. We refuse to participate in “open washing” the industry practice of releasing crippled “community edition” software designed to manipulate users into buying a paid upgrade to unlock basic hypervisor features.
This architectural separation ensures that Karios BSD remains an independent, highly functional playground for developers and enthusiasts, while Karios Core serves the distinct operational, scalability, and security needs of global enterprises