Linux kernel source tree

How to Make a Computer Operating System in C++

mimalloc is a compact general purpose allocator with excellent performance.

Legacy mirror of Darwin Kernel. Replaced by https://github.com/apple-oss-distributions/xnu

Original Windows File Manager (winfile) with enhancements

A completely-from-scratch hobby operating system: bootloader, kernel, drivers, C library, and userspace including a composited graphical UI, dynamic linker, syntax-highlighting text editor, network…

A Small C Compiler

A standalone and lightweight C library

OSv, a new operating system for the cloud.

FuzixOS: Because Small Is Beautiful

A UNIX-like kernel for the i386 architecture

Minimal unit testing framework for C

A microkernel-based hackable operating system.

A collection of memory allocators

A general purpose memory allocator that implements an isolation security strategy to mitigate memory safety issues while maintaining good performance

Manticore is a research operating system, written in Rust.

Meta fork of the OG Jemalloc project

Very very old history of Vim (from v1.14 to v6.4)

TinyLinux mini linux kernel implmentation from scratch

『はじめて読む486』のサンプルプログラム集です。

Pedigree operating system

OLD qemu with Raspberry Pi 2 and Windows on ARM support. Retained for reference purposes only -- most of this has been merged upstream.

a hobby operating system written in C

Mcube Kernel: Operating System Supporting Dynamically Switchable Kernel Models

Brainfuck with Actors

こちらは教育用自作組み込みOSであるKOZOSをRaspberry Piへ移植したものです。This is an KOZOS(http://kozos.jp/kozos/) port to Raspberry Pi.

Keeley's - Operating System (K-OS)

Developing an operating system from scratch (Advent Calendar 2018)

Simple OS.