Linux kernel source tree

For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

Modern HTTP benchmarking tool

A code-searching tool similar to ack, but faster.

Cross-platform asynchronous I/O

A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input

Embedded web server, with TCP/IP network stack, MQTT and Websocket

H2O - the optimized HTTP/1, HTTP/2, HTTP/3 server

A small C compiler

Writing a sqlite clone from scratch in C

xv6 OS

Screaming-fast Python 3.5+ HTTP toolkit integrated with pipelining HTTP server based on uvloop and picohttpparser.

A fast entity component system (ECS) for C & C++

Higher level programming in C

A Small C Compiler

Lightweight Ruby

A standalone and lightweight C library

3D Content Creation Tools

Nmap Project's Windows packet capture and transmission library

Bash's powerful command line editing in cmd.exe

Vifm is a file manager with curses interface, which provides Vim-like environment for managing objects within file systems, extended with some useful ideas from mutt.

Prime number projects in 100+ programming languages, to compare their speed - and their programmer's cleverness

A Parser Combinator library for C

📽 Highly Optimized 2D / 3D Graphics Math (glm) for C

Clean-code version of the baseflight flight controller firmware

Python frame stack sampler for CPython

Pure C Game Engine

Universal configuration library parser

The Mongrel2 Web Server Project

A simple, kernel-space, on-disk filesystem from the scratch