- 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.
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