Complete, independent operating system built by humans.

Tutorial: Writing a "bare metal" operating system for Raspberry Pi 4

A shell parser, formatter, and interpreter with bash and zsh support; includes shfmt

Read-only git conversion of OpenBSD's official CVS src repository. Pull requests not accepted - send diffs to the tech@ mailing list.

Intel Wi-Fi Drivers for macOS

Experimental x86_64 kernel project. Planned eventual successor to the kernel in ToaruOS. WIP

Dialect of Python with explicit variable declaration and block scoping, with a lightweight and easy-to-embed bytecode compiler and interpreter.

Simple DirectMedia Layer

A small C11 compiler

A minimalist C compiler with x86_64 code generation

Mixxx is Free DJ software that gives you everything you need to perform live mixes.

A compiler for a tiny (but growing!) subset of C, written in OCaml.

in only 250 lines of code (no libs, just vanilla code)

Yet another tiny tiny self-hosted C compiler, assembler, linker and standard C library.

Toy C compiler

C compiler created in Python.

Fast and lightweight HTML/CSS rendering engine

Simple C compiler

Small C Compiler generating ELF executable Arm architecture, supporting JIT execution

A Small C Compiler

https://www.sigbus.info/compilerbook/

The lcc retargetable ANSI C compiler

A Small C Compiler

small self hosting C compiler

A text editor in less than 1000 LOC with syntax highlight and search.

AquilaOS: UNIX-like Operating System

An operating system written in D

Ghost, a micro-kernel based hobby operating system.

A dead simple editor

https://www.amazon.co.jp/30%E6%97%A5%E3%81%A7%E3%81%A7%E3%81%8D%E3%82%8B-OS%E8%87%AA%E4%BD%9C%E5%85%A5%E9%96%80-%E5%B7%9D%E5%90%88-%E7%A7%80%E5%AE%9F-ebook/dp/B00IR1HYI0/ref=sr_1_1?ie=UTF8&qid=1517…