- Amoeba
 - A distributed operating system that is freely available via the Internet for educational and research users - BlueOS
- Ports the BeOS to Linux.
- FreeOS.com
- Provides articles, documentation, download sites, news, links and more relating to free operating systems.
- K42
- High performance, general-purpose operating system kernel for cache-coherent multiprocessors.
- Kerneltrap.com
- News, information, and discussion hub for software engineers and hobbyists interested in low-level systems programming and kernel development.
- Living Without Microsoft
- News, FAQs, and essays devoted to Open Source and proprietary alternatives to Microsoft products.
- Lockergnome
- Offers a variety of daily newsletters regarding technology and computing.
- Menuet OS
- Downloadable OS written in assembly.
- Multi-booting Revolution, The
- Short analysis of the options available to those looking to run multiple operating systems from a single hard disk.
- Multiuser DOS
- Information, software, patches, and support for the IMS Multiuser DOS real time operating system.
- Nemesis
- Design is geared to the support of time-sensitive applications requiring a consistent Quality of Service (QoS), such as those which use multimedia.
- Operating System Comparison
- Operating System Sucks-Rules-O-Meter
- Searches the Web for positive of negative references to various operating systems and compiles them into a graph for easy comparisons.
- OS Files, The
- Brief overview of the various operating systems available today.
- OS News
- Covering alternative computing environments and technology.
- OS/C
- Microkernel operating system designed to perform network activities without excessively engaging system resources.
- PetrOS
- 32 bit operating system for PCs, from Trumpet Software.
- Plex86.org
- Goal is to create an extensible open source PC virtualization software programme which will allow PC and workstation users to run multiple operating systems concurrently on the same machine.
- Posix Programmer's Guide
- Guide to writing programmes for POSIX conforming environments including UNIX, openVMS, MVS, and Windows NT
- Review of Operating Systems
- sysprog.net
- A site for MVS and Linux systems programmers with industry news, tools, quotations, and job banks.
- System Toolbox
- Dedicated to covering various server operating systems for administrators.
- YouOS
- An operating system that works entirely from your web browser so you can access it anywhere there's an Internet connection.
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