NetBSD
NetBSD is a free, open-source, and highly portable Unix-like operating system derived from the Berkeley Software Distribution (BSD). It is known for its clean design, stability, and emphasis on portability across a wide range of hardware architectures, from embedded devices to servers and desktops. The system includes a complete kernel, userland utilities, and a package management system, making it suitable for various computing environments.
Developers should learn or use NetBSD when working on projects that require cross-platform compatibility, such as embedded systems, research, or server deployments where reliability and security are critical. It is particularly valuable for its POSIX compliance, extensive hardware support, and the ability to run on legacy or niche hardware, making it ideal for educational purposes, networking applications, and environments that demand a minimal and auditable codebase.