ClearOS

Clear Linux OS is an open source, rolling release Linux distribution optimized for performance and security, from the Cloud to the Edge, designed for customization, and manageability. Operate without any custom configuration, for example, a generic host with an empty /etc directory. Stateless systems strictly separate the OS configuration, the per-system configuration, and the VT user-data stored on that system. Designed so that the user is able to quickly and easily manage their custom configuration vs. system configuration. Clear Linux OS optimizes across the whole stack: the platform, kernel, math libraries, middleware layers, frameworks, and runtime. Clear Linux OS has an automated tool that is constantly scanning for CVEs, which are patched accordingly. This strict separation between User and System files allows for easier manageability and simplifying customization.

IPFire is a hardened, versatile, state-of-the-art Open Source firewall based on Linux. Its ease of use, high performance in any scenario, and extensibility make it usable for everyone. Security is the highest priority in IPFire. It is hardened to protect itself from attacks from the Internet and prevents attacks on your network. Its powerful firewall engine and intrusion prevention system protect your network against attacks from the Internet and denial-of-service attacks. IPFire is free software developed by an open community and trusted by hundreds of thousands of users from all around the world. The primary objective of IPFire is security. It's easy to configure a firewall engine and an intrusion prevention system stops any attackers from breaking into your network. In the default configuration, the network is split into various zones with different security policies such as a LAN and DMZ to manage risks inside the network and have a custom configuration for specific needs.