Octelium is a free, open-source platform designed for unified zero trust secure access, functioning as a versatile solution for remote access VPNs, ZTNA, API gateways, and more. It offers scalable identity-based, application-layer access control and supports both client-based and clientless access methods. The platform is self-hosted and designed for easy deployment on Kubernetes, making it suitable for various use cases including homelab setups and containerized application management.