Operating System Guides

• Freebyte's Guide to Free and non-free Operating Systems  - Features operating systems that serve as alternatives to Windows. Includes descriptions, download links, and screenshots.
• NSA/CSS Operating Systems  - Security configuration guides for various operating systems from the National Security Agency Central Security Service.
• OS Config  - Presents OS drivers and tips as well as programming tutorials, fonts gallery, and web development resources.
• OS Files  - Portal of operating systems that run on x86 platform. Provides version history, news, support and comparisons.
• Vintage Operating System  - Provides information on vintage OS includes DOS, Linux, Mac, BSD, Unix, Windows and MVS. Plus feedback and related links.