NetBSD

NetBSD is a free, fast, and secure Unix-like operating system known for its emphasis on code clarity, portability, and clean design. It is designed to run on a vast range of hardware architectures, from embedded devices and handhelds to large-scale servers and workstations. By maintaining a highly modular and hardware-independent codebase, it serves as a versatile foundation for research, specialized appliance development, and environments where high performance and stability are required across diverse platforms.