EndianOS is a hardened Linux-based operating system designed to provide comprehensive security for both IT and OT network environments. The platform offers two main variants: EndianOS UTM for business environments and EndianOS 4i for industrial control systems (ICS) and operational technology (OT) environments. EndianOS UTM delivers multi-layered network security with integrated firewall, intrusion prevention, antivirus, and zero-day threat protection capabilities. It provides secure VPN connectivity and granular network traffic control through an intuitive web-based management interface. The platform supports flexible deployment options including hardware appliances, virtual machines, and cloud environments. EndianOS 4i is specifically engineered for industrial environments, offering specialized security for ICS and OT networks. It includes protocol filtering capabilities tailored for industrial protocols, along with the same core security features adapted for operational technology requirements. The platform enables secure remote access, micro-segmentation, and zero-trust security architectures. Both variants are built on a hardened Linux kernel and provide centralized management capabilities. The platform supports edge computing scenarios and facilitates seamless IT/OT integration. EndianOS aims to deliver reliable connectivity, strong security controls, and operational flexibility for modern digital infrastructure requirements.