VyOS

VyOS is an open source operating system for network devices such as routers and firewalls. It combines high-performance routing, firewalling, and VPN in a single platform, managed through a unified command-line configuration model rather than separate per-feature tools.

Built as a GNU/Linux distribution based on Debian, VyOS bundles components like FRR for routing and Netfilter for packet filtering into one installable image. It runs on bare metal, virtual machines, and the cloud, with images published for AWS, Azure, and GCP, making it suitable for data center, edge, and hybrid-cloud networks.

Development follows a rolling branch for the newest code, with long-term support branches cut at feature freeze and named after constellations. VyOS is free of per-device licensing and is released under the GNU General Public License version 2.