- Domainatrix
- Intel/MD x86 architecture operating system, with list of features.
- Hactar
- Contains overview, source code information, list of requirements for text-based and graphics console.
- HanoiOS
- Implementation of Hanoi OS for x86. Includes downloadable files, source archive and sample screenshot of applications.
- Mobius Operating System: SourceForge
- IA-32 platform open-source OS, compatible with POSIX and Win32. Includes references and sample screenshots of application with brief descriptions.
- PizziOS
- Small 386+ operating system designed for speed. Plus project status, downloads and related links.
- PM_SZ_OS
- 32-Bit protect mode OS for 486+ processors. With list of supported filesystems and screenshots of WinSZ application.
- ScottsNewOS
- Features an OS with a graphical user interface that was designed to run on as little as four megabytes of RAM.
- SkyOS
- Operating system written for x86-based personal computers. Contains documentation, forum, news and FAQs.
- Synapse Operating Services
- Intended to run on x86-64 with some changes. Provides project details and news.
- TriangleOS
- 32-bit multi-tasking operating system for x86 platform, written in C and Assembly. Plus overview, news and FAQs.
- Visopsys
- Alternative OS for PC-compatible, free software and licensed under GNU GPL. Includes news, change log and files for download with descriptions.
- XAOS
- Operating system that runs on Intel 386+ processors. Plus technical information and downloadables with brief descriptions.
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