- Amateur OS: AMOS - Scott Billingsley's OS: realtime for DSP and amateur radio, one user/application, 16-bit real mode, for i386+, FAT 12/16; no TSRs, library of routines to program into apps, minimal kernel support (minimize interrupts), written in NASM assembly and Sphnix C--.
- DS-OS - Good way to learn OS programming: balanced amount of functionality for learning: not too much to overwhelm beginners, yet some advanced features; done in pure 8086 Assembly via A86 assembler, incompatible with all other OSs. [Open Source]
- EduOS - Operating system for the IA-32 (80386+) processors. For education purposes only, includes full source code, under active development. Needs Linux or BeOS to be compiled. [Open Source]
- FDOS - Essay and OS for learning, so people who want to know more of technicals in PCs can find interesting answers presented easily; FAT 12 file, directory support; 100% NASM, documents, website in English, German; (c) Stefan Tappertzhofen. [Open Source, GPL]
- Instinct Operating System - A command-line OS written in x86 assembly, designed as a learning tool for college students and amateur programmers. Download available. [Open Source]
- KoNK/OS - One author, experimental, multitasking, multithreaded, microkernel OS, being used to learn concepts of OS design. Includes Programmer's Manual.
- KOS - Kid Operating System. Modular (run-time dynamic linking), preemptive multitasking, to have SVR4-like VM. Begun 1998 by young programmers, most of them students. Goal: not obtaining OS, but learning OS internals and functioning of x86 processors. Downloads, links, documentation. [Open Source, GPL]
- NACHOS - Not Another Completely Heuristic Operating System: teaching OS coded in C++ subset, developed at UC Berkeley for OS and Systems Programming classes; now used worldwide. Descriptions, FAQ, port and bug lists, assignments, downloads. [Open Source]
- Nachos/486 - Port, extension of instructional OS, now stand-alone, protected mode, multithreaded, compiles in FreeBSD to run on i486+, can be relinked without recompile. Descriptions, report (HTML, PDF, PS), download. [Open Source]
- RCOS - Ron Chernich's OS: computer learning tool animates operation of multi-tasking OS; true OS, runs programs; object-oriented, message passing kernel lets parts be replaced easily, C++ coded, portable, runs on DOS, RCOSjava precursor.
- ShawnOS - Sure as Hell Ain't Windows Ninety five, the corner cutting OS due to the original schedule. Always intended more as a learning experience for author and others than as a practical, useful OS. Everything done as simply as possible. [Open Source, GPL]
- SunriseOS - Tiny operating system written in Assembly, via NASM, by ICT student. Meant for only fun and learning. [Open Source]
- Topsy - Teachable Operating System: tiny multithreaded messaging microkernel, in ANSI C; protected threads, memory managed, and thread/process control. From undergraduate course on concurrency, device programming, OS concepts. Descriptions, documents, theses, downloads, contacts, links. [Open Source, GPL]
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