| Ace Operating System Project | | An open source operating system for X86 architecture. It also contains documents, specifications explaning various hardware. |
| Agnix | | An open source project, which has been founded to provide an educational, network operating system kernel. |
| Cottontail OS Development Library | | Old non-updated mirror online library covering a plethora of OS development topics. Datasheets, tutorials, reference manuals and hardware programming information. |
| Groovyweb: Operating system programming | | An open source os written in Turbo C (for DOS/ windows) and nasm (Windows/Dos/Linux) as well as two exclusive tutorials on how to write an operating system. |
| How to Program a Bootstrap Loader | | A bootstrap tutorial that includes assembly language code to demonstrate loading and executing a binary image from a FAT filesystem. |
| KernelNewbies.org | | Resources for programmers new to kernel hacking. Example code, FAQs, utilities for debugging modules. |
| LusitanOS | | Open source operating system, planned to be an OS entirely made by Portuguese people and built mainly as a way of self-learning and research on operating systems development. [Open source] |
| Mainframe Programming | | The mainframe continues to grow and transform itself while maintaining its reliability, security and speed. |
| Operating System Index | | A list of educational and experimental operating systems aiming to help developers who are looking for code examples. |
| Operating System Lecture Notes | | Notes on operating system theory, source code of describing actual construction of operating system in C programming language. Also OS construction related links to books, notes, tutorials, and news groups. |
| Operating Systems and System Software | | Contains sources of a minimal kernel, a new CPU scheduler for Linux, multithreading in Linux, systems software in DOS and collection of good reference material for OS lovers. |
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