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• Build your own 3D Renderer

  • C++: Introduction to Ray Tracing: a Simple Method for Creating 3D Images
  • C++: How OpenGL works: software rendering in 500 lines of code
  • Java + JavaScript: Build your own 3D renderer
  • Java: How to create your own simple 3D render engine in pure Java

• Build your own Blockchain / Cryptocurrency

  • Ethereum: From “What is Blockchain?” to building a blockchain in less than an hour
  • Java: Creating Your First Blockchain with Java
  • JavaScript: A cryptocurrency implementation in less than 1500 lines of code
  • JavaScript: Build your own Blockchain in Javascript
  • JavaScript: Learn & Build a Javascript Blockchain
  • Go: Building Blockchain in Go
  • Python: Learn Blockchains by Building One
  • Python: Build your own blockchain: a Python tutorial
  • TypeScript: Naivecoin: a tutorial for building a cryptocurrency

• Build your own Bot

  • Haskell: Roll your own IRC bot
  • Node.js: Creating a Simple Facebook Messenger AI Bot with API.ai in Node.js
  • Node.js: Why you should have your own Twitter bot, and how to build one in less than 30 minutes
  • Node.js: How to make a responsive telegram bot
  • PHP: Let’s write a cryptocurrency bot
  • Python: Step-by-Step Instructions for Building a Basic Facebook Chat Bot
  • Python: Build a Reddit Bot
  • Python: How To Make A reddit Bot [video]
  • Python: How To Create a Telegram Bot Using Python
  • Python: Create a Twitter Bot in Python Using Tweepy
  • R: Build A Cryptocurrency Trading Bot with R

• Build your own Database

  • C: Let's Build a Simple Database
  • C++: Implementing a Key-Value Store
  • C#: Build Your Own Database
  • Clojure: An Archaeology-Inspired Database
  • JavaScript: Dagoba: an in-memory graph database
  • Python: DBDB: Dog Bed Database

• Build your own Front-end Framework / Library

  • JavaScript: A DIY guide to build your own React
  • JavaScript: Reverse Engineering React
  • JavaScript: Building React From Scratch [video]
  • JavaScript: Building Your Own React Clone in Five Easy Steps
  • JavaScript: Build your own Vuejs
  • JavaScript: Build Yourself a Redux
  • JavaScript: Let’s Write Redux!
  • JavaScript: Redux: Implementing Store from Scratch
  • JavaScript: Build Your own Simplified AngularJS in 200 Lines of JavaScript
  • JavaScript: How to write your own Virtual DOM

• Build your own Docker

  • C: Linux containers in 500 lines of code
  • Go: Building a container from scratch in Go [video]
  • Python: A workshop on Linux containers: Rebuild Docker from Scratch
  • Python: A proof-of-concept imitation of Docker, written in 100% Python
  • Shell: Docker implemented in around 100 lines of bash

• Build your own Game

  • C: Handmade Hero
  • C: How to Program an NES game in C  * C: Chess Engine In C [video]
  • C: Let's Make: Dangerous Dave [video]
  • C: Learn Video Game Programming in C [video]
  • C: Coding A Sudoku Solver in C [video]
  • C: Coding a Rogue/Nethack RPG in C [video]
  • C: Tutorial For a Brickout Clone
  • C: A tutorials for a basic Invaders game made in C with GTK: and OpenGL
  • C: Astroids Tutorial written in C using GTK with OpenGL and DashGL for matrix manipulation
  • C++: How To Make Minecraft in C++/ OpenGL [video]
  • C++: Breakout
  • C++: Beginning Game Programming v2.0
  • C#: Learn C# by Building a Simple RPG
  • C#: Creating a Roguelike Game in C#
  • JavaScript: 2D breakout game using Phaser
  • JavaScript: How to Make Flappy Bird in HTML5 With Phaser
  • Lua: BYTEPATH
  • Ruby: Write Yourself a Roguelike
  • Ruby: Developing Games With Ruby

• Build your own Git

  • JavaScript: Gitlet
  • JavaScript: Build GIT - Learn GIT
  • Python: Just enough of a Git client to create a repo, commit, and push itself to GitHub
  • Ruby: Rebuilding Git in Ruby

• Build your own Neural Network

  • C#: Neural Network OCR
  • Go: Build a multilayer perceptron with Golang
  • Go: How to build a simple artificial neural network with Go
  • Go: Building a Neural Net from Scratch in Go
  • Java: Neural Networks: Perceptron [video]
  • JavaScript: Neural Network implementation in Javascript, by an example
  • JavaScript: Neural networks from scratch for Javascript linguists (Part1 — The Perceptron)
  • JavaScript: You can build a neural network in JavaScript even if you don’t really understand neural networks
  • JavaScript: How to create a Neural Network in JavaScript in only 30 lines of code
  • Python: Optical Character Recognition (OCR)

• Build your own Network Stack

  • C: Beej's Guide to Network Programming
  • C: Let's code a TCP/IP stack
  • Ruby: How to build a network stack in Ruby

• Build your own Operating System

  • Assembly: Writing a Tiny x86 Bootloader
  • C: Operating Systems: From 0 to 1
  • C: The little book about OS development
  • C: Kernel 101 –Let’s write a Kernel
  • C: Build a minimal multi-tasking kernel for ARM from scratch
  • C: How to create an OS from scratch
  • C: Malloc tutorial
  • C: Hack the virtual memory
  • C++: Writing a Bootloader
  • Rust: Writing an OS in Rust

• Build your own Programming Language

  • C: Crafting interpreters: A handbook for making programming languages
  • C: http://journal.stuffwithstuff.com/2013/12/08/babys-first-garbage-collector/
  • C: Build Your Own Lisp: Learn C and build your own programming language in 1000 lines of code
  • C: Implement a minimal interpreter, Compiler (x86/Arm) and JIT compiler from scratch
  • C++: Writing Your Own Toy Compiler Using Flex
  • Go: Lexical Scanning in Go [video]
  • Haskell: Let's Build a Compiler
  • Haskell: Write You a Haskell
  • JavaScript: The Super Tiny Compiler
  • OCaml: Writing a C Compiler
  • Racket: Beautiful Racket: How to make your own programming languages with Racket
  • Ruby: A Compiler From Scratch
  • Python: A Python Interpreter Written in Python
  • Python: lisp.py: Make your own Lisp interpreter
  • Python: Simple Iterator-based Parsing
  • Python: Simple Top-Down Parsing in Python

• Build your own Regex Engine

  • C: A Regular Expression Matcher
  • C: Regular Expression Matching Can Be Simple And Fast
  • JavaScript: Build a Regex Engine in Less than 40 Lines of Code
  • Perl: How Regexes Work
  • Scala: No Magic: Regular Expressions

• Build your own Shell

  • C: Tutorial - Write a Shell in C
  • C: Let's build a shell!
  • C: Writing a UNIX Shell - Part I
  • Ruby: A Unix Shell in Ruby

• Build your own Template Engine

  • JavaScript: JavaScript template engine in just 20 lines
  • Python: Approach: Building a toy template engine in Python
  • Python: A Template Engine
  • Ruby: How to write a template engine in less than 30 lines of code

• Build your own Web Server

  • C#: Writing a Web Server from Scratch
  • Node.js: Let's code a web server from scratch with NodeJS Streams
  • PHP: Writing a webserver in pure PHP
  • Python: A Simple Web Server
  • Python: Let’s Build A Web Server.
  • Python: Web application from scratch
  • Python: Building a basic HTTP Server from scratch in Python
  • Ruby: Building a simple websockets server from scratch in Ruby

• Uncategorized

  • Alloy: The Same-Origin Policy
  • C: Build Your Own Text Editor
  • C: How to Write a Video Player in Less Than 1000 Lines
  • C: Learn how to write a hash table in C
  • C++: Build your own VR headset for $100
  • C++: How to write an emulator (CHIP-8 interpreter)
  • C++: Writing a Linux Debugger
  • C++: How a 64k intro is made
  • Go: Build a web application in Go
  • Java: Build a Flashlight App [video]
  • JavaScript: Learn JavaScript Promises by Building a Promise from Scratch
  • Python: A Pedometer in the Real World
  • Python: How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes
  • Python: Continuous Integration System
  • Python: Building a Facial Recognition Pipeline with Deep Learning in Tensorflow
  • Rust: Let's build a browser engine

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