In-depth software programming
Tags: software, programming, deepsoftware, deepprogramming
Published: 2021-02-27 10:49:51

Whatever you do in software programming, you have to understand the roots and focus on the basic knowledge

The computer won't work without software. The software, also called programs, is responsible for telling the computer what to do and how to do it.

The two main types of software are system software and application software:
* The system software, also known as the operating system (OS), is responsible for running the computer.
* Application software is a program that allows a user to perform a specific job on a computer.

# 1. Build your own `3D Renderer`

* [**C++**: _Introduction to Ray Tracing: a Simple Method for Creating 3D Images_](https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/how-does-it-work)
* [**C++**: _How OpenGL works: software rendering in 500 lines of code_](https://github.com/ssloy/tinyrenderer/wiki)
* [**C++**: _Raycasting engine of Wolfenstein 3D_](http://lodev.org/cgtutor/raycasting.html)
* [**C++**: _Physically Based Rendering:From Theory To Implementation_](http://www.pbr-book.org/)
* [**C++**: _Rasterization: a Practical Implementation_](https://www.scratchapixel.com/lessons/3d-basic-rendering/rasterization-practical-implementation/overview-rasterization-algorithm)
* [**C# / TypeScript / JavaScript**: _Learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript_](https://www.davrous.com/2013/06/13/tutorial-series-learning-how-to-write-a-3d-soft-engine-from-scratch-in-c-typescript-or-javascript/)
* [**Java / JavaScript**: _Build your own 3D renderer_](https://avik-das.github.io/build-your-own-raytracer/)
* [**Java**: _How to create your own simple 3D render engine in pure Java_](http://blog.rogach.org/2015/08/how-to-create-your-own-simple-3d-render.html)
* [**JavaScript / Pseudocode**: _Computer Graphics from scratch_](http://www.gabrielgambetta.com/computer-graphics-from-scratch/introduction.html)
* [**Python**: _A 3D Modeller_](http://aosabook.org/en/500L/a-3d-modeller.html)

# 2. Build your own `Augmented Reality`

* [**C#**: _How To: Augmented Reality App Tutorial for Beginners with Vuforia and Unity 3D_](https://www.youtube.com/watch?v=uXNjNcqW4kY) [video]
* [**C#**: _How To Unity ARCore_](https://www.youtube.com/playlist?list=PLKIKuXdn4ZMjuUAtdQfK1vwTZPQn_rgSv) [video]
* [**C#**: _AR Portal Tutorial with Unity_](https://www.youtube.com/playlist?list=PLPCqNOwwN794Gz5fzUSi1p4OqLU0HTmvn) [video]
* [**C#**: _How to create a Dragon in Augmented Reality in Unity ARCore_](https://fr-film.net/v-how-to-create-a-dragon-in-augmented-reality-in-unity-arcore-tutorial-qTSDPkPyPqs.html) [video]
* [**C#**: _How to Augmented Reality AR Tutorial: ARKit Portal to the Upside Down_](https://www.youtube.com/watch?v=Z5AmqMuNi08) [video]
* [**Python**: _Augmented Reality with Python and OpenCV_](https://bitesofcode.wordpress.com/2017/09/12/augmented-reality-with-python-and-opencv-part-1/)

# 3. Build your own `BitTorrent Client`

* [**C#**: _Building a BitTorrent client from scratch in C#_](https://www.seanjoflynn.com/research/bittorrent.html)
* [**Go**: _Building a BitTorrent client from the ground up in Go_](https://blog.jse.li/posts/torrent/)
* [**Nim**: _Writing a Bencode Parser_](https://xmonader.github.io/nimdays/day02_bencode.html)
* [**Node.js**: _Write your own bittorrent client_](https://allenkim67.github.io/programming/2016/05/04/how-to-make-your-own-bittorrent-client.html)
* [**Python**: _A BitTorrent client in Python 3.5_](http://markuseliasson.se/article/bittorrent-in-python/)

# 4. Build your own `Blockchain / Cryptocurrency`

* [**ATS**: _Functional Blockchain_](https://beta.observablehq.com/@galletti94/functional-blockchain)
* [**C#**: _Programming The Blockchain in C#_](https://programmingblockchain.gitbooks.io/programmingblockchain/)
* [**Crystal**: _Write your own blockchain and PoW algorithm using Crystal_](https://medium.com/@bradford_hamilton/write-your-own-blockchain-and-pow-algorithm-using-crystal-d53d5d9d0c52)
* [**Go**: _Building Blockchain in Go_](https://jeiwan.cc/posts/building-blockchain-in-go-part-1/)
* [**Go**: _Code your own blockchain in less than 200 lines of Go_](https://medium.com/@mycoralhealth/code-your-own-blockchain-in-less-than-200-lines-of-go-e296282bcffc)
* [**Java**: _Creating Your First Blockchain with Java_](https://medium.com/programmers-blockchain/create-simple-blockchain-java-tutorial-from-scratch-6eeed3cb03fa)
* [**JavaScript**: _A cryptocurrency implementation in less than 1500 lines of code_](https://github.com/conradoqg/naivecoin)
* [**JavaScript**: _Build your own Blockchain in JavaScript_](https://github.com/nambrot/blockchain-in-js)
* [**JavaScript**: _Learn & Build a JavaScript Blockchain_](https://medium.com/digital-alchemy-holdings/learn-build-a-javascript-blockchain-part-1-ca61c285821e)
* [**JavaScript**: _Creating a blockchain with JavaScript_](https://github.com/SavjeeTutorials/SavjeeCoin)
* [**JavaScript**: _How To Launch Your Own Production-Ready Cryptocurrency_](https://hackernoon.com/how-to-launch-your-own-production-ready-cryptocurrency-ab97cb773371)
* [**JavaScript**: _Writing a Blockchain in Node.js_](https://www.hackdoor.io/articles/writing-a-blockchain-in-nodejs-6512fec33307)
* [**Kotlin**: _Let’s implement a cryptocurrency in Kotlin_](https://medium.com/@vasilyf/lets-implement-a-cryptocurrency-in-kotlin-part-1-blockchain-8704069f8580)
* [**Python**: _Learn Blockchains by Building One_](https://hackernoon.com/learn-blockchains-by-building-one-117428612f46)
* [**Python**: _Build your own blockchain: a Python tutorial_](http://ecomunsing.com/build-your-own-blockchain)
* [**Python**: _A Practical Introduction to Blockchain with Python_](http://adilmoujahid.com/posts/2018/03/intro-blockchain-bitcoin-python/)
* [**Python**: _Let’s Build the Tiniest Blockchain_](https://medium.com/crypto-currently/lets-build-the-tiniest-blockchain-e70965a248b)
* [**Ruby**: _Programming Blockchains Step-by-Step (Manuscripts Book Edition)_](https://github.com/yukimotopress/programming-blockchains-step-by-step)
* [**Scala**: _How to build a simple actor-based blockchain_](https://medium.freecodecamp.org/how-to-build-a-simple-actor-based-blockchain-aac1e996c177)
* [**TypeScript**: _Naivecoin: a tutorial for building a cryptocurrency_](https://lhartikk.github.io/)
* [**TypeScript**: _NaivecoinStake: a tutorial for building a cryptocurrency with the Proof of Stake consensus_](https://naivecoinstake.learn.uno/)

# 5. Build your own `Bot`

* [**Haskell**: _Roll your own IRC bot_](https://wiki.haskell.org/Roll_your_own_IRC_bot)
* [**Java**: _How To Make a Scary Russian Twitter Bot With Java_](https://medium.com/@SeloSlav/how-to-make-a-scary-russian-twitter-bot-with-java-b7b62768a3ac)
* [**Node.js**: _Creating a Simple Facebook Messenger AI Bot with API.ai in Node.js_](https://tutorials.botsfloor.com/creating-a-simple-facebook-messenger-ai-bot-with-api-ai-in-node-js-50ae2fa5c80d)
* [**Node.js**: _How to make a responsive telegram bot_](https://www.sohamkamani.com/blog/2016/09/21/making-a-telegram-bot/)
* [**Node.js**: _Create a Discord bot_](https://discordjs.guide/)
* [**Node.js**: _gifbot - Building a GitHub App_](https://blog.scottlogic.com/2017/05/22/gifbot-github-integration.html)
* [**Node.js**: _Building A Simple AI Chatbot With Web Speech API And Node.js_](https://www.smashingmagazine.com/2017/08/ai-chatbot-web-speech-api-node-js/)
* [**Python**: _How to Build Your First Slack Bot with Python_](https://www.fullstackpython.com/blog/build-first-slack-bot-python.html)
* [**Python**: _How to build a Slack Bot with Python using Slack Events API & Django under 20 minute_](https://medium.com/freehunch/how-to-build-a-slack-bot-with-python-using-slack-events-api-django-under-20-minute-code-included-269c3a9bf64e)
* [**Python**: _Build a Reddit Bot_](http://pythonforengineers.com/build-a-reddit-bot-part-1/)
* [**Python**: _How To Make A Reddit Bot_](https://www.youtube.com/watch?v=krTUf7BpTc0) [video]
* [**Python**: _How To Create a Telegram Bot Using Python_](https://khashtamov.com/en/how-to-create-a-telegram-bot-using-python/)
* [**Python**: _Create a Twitter Bot in Python Using Tweepy_](https://medium.freecodecamp.org/creating-a-twitter-bot-in-python-with-tweepy-ac524157a607)
* [**Python**: _Creating Reddit Bot with Python & PRAW_](https://www.youtube.com/playlist?list=PLIFBTFgFpoJ9vmYYlfxRFV6U_XhG-4fpP) [video]
* [**R**: _Build A Cryptocurrency Trading Bot with R_](https://towardsdatascience.com/build-a-cryptocurrency-trading-bot-with-r-1445c429e1b1)
* [**Rust**: _A bot for Starcraft in Rust, C or any other language_](https://habr.com/en/post/436254/)

# 6. Build your own `Command-Line Tool`

* [**Go**: _Visualize your local git contributions with Go_](https://flaviocopes.com/go-git-contributions/)
* [**Go**: _Build a command line app with Go: lolcat_](https://flaviocopes.com/go-tutorial-lolcat/)
* [**Go**: _Building a cli command with Go: cowsay_](https://flaviocopes.com/go-tutorial-cowsay/)
* [**Go**: _Go CLI tutorial: fortune clone_](https://flaviocopes.com/go-tutorial-fortune/)
* [**Nim**: _Writing a stow alternative to manage dotfiles_](https://xmonader.github.io/nimdays/day06_nistow.html)

# 7. Build your own `Database`

* [**C**: _Let's Build a Simple Database_](https://cstack.github.io/db_tutorial/)
* [**C++**: _Implementing a Key-Value Store_](http://codecapsule.com/2012/11/07/ikvs-implementing-a-key-value-store-table-of-contents/)
* [**C#**: _Build Your Own Database_](https://www.codeproject.com/Articles/1029838/Build-Your-Own-Database)
* [**Clojure**: _An Archaeology-Inspired Database_](http://aosabook.org/en/500L/an-archaeology-inspired-database.html)
* [**Crystal**: _Why you should build your own NoSQL Database_](https://medium.com/@marceloboeira/why-you-should-build-your-own-nosql-database-9bbba42039f5)
* [**JavaScript**: _Dagoba: an in-memory graph database_](http://aosabook.org/en/500L/dagoba-an-in-memory-graph-database.html)
* [**Python**: _DBDB: Dog Bed Database_](http://aosabook.org/en/500L/dbdb-dog-bed-database.html)
* [**Python**: _Write your own miniature Redis with Python_](http://charlesleifer.com/blog/building-a-simple-redis-server-with-python/)

# 8. Build your own `Docker`

* [**C**: _Linux containers in 500 lines of code_](https://blog.lizzie.io/linux-containers-in-500-loc.html)
* [**Go**: _Build Your Own Container Using Less than 100 Lines of Go_](https://www.infoq.com/articles/build-a-container-golang)
* [**Go**: _Building a container from scratch in Go_](https://www.youtube.com/watch?v=8fi7uSYlOdc) [video]
* [**Python**: _A workshop on Linux containers: Rebuild Docker from Scratch_](https://github.com/Fewbytes/rubber-docker)
* [**Python**: _A proof-of-concept imitation of Docker, written in 100% Python_](https://github.com/tonybaloney/mocker)
* [**Shell**: _Docker implemented in around 100 lines of bash_](https://github.com/p8952/bocker)

# 9. Build your own `Emulator / Virtual Machine`

* [**C**: _Virtual machine in C_](https://blog.felixangell.com/virtual-machine-in-c/)
* [**C**: _Write your Own Virtual Machine_](https://justinmeiners.github.io/lc3-vm/)
* [**C**: _Writing a Game Boy emulator, Cinoop_](https://cturt.github.io/cinoop.html)
* [**C++**: _How to write an emulator (CHIP-8 interpreter)_](http://www.multigesture.net/articles/how-to-write-an-emulator-chip-8-interpreter/)
* [**C++**: _Emulation tutorial (CHIP-8 interpreter)_](http://www.codeslinger.co.uk/pages/projects/chip8.html)
* [**C++**: _Emulation tutorial (GameBoy emulator)_](http://www.codeslinger.co.uk/pages/projects/gameboy.html)
* [**C++**: _Emulation tutorial (Master System emulator)_](http://www.codeslinger.co.uk/pages/projects/mastersystem/memory.html)
* [**C++**: _NES Emulator From Scratch_](https://www.youtube.com/playlist?list=PLrOv9FMX8xJHqMvSGB_9G9nZZ_4IgteYf) [video]
* [**Common Lisp**: _CHIP-8 in Common Lisp_](http://stevelosh.com/blog/2016/12/chip8-cpu/)
* [**JavaScript**: _GameBoy Emulation in JavaScript_](http://imrannazar.com/GameBoy-Emulation-in-JavaScript)
* [**Python**: _Emulation Basics: Write your own Chip 8 Emulator/Interpreter_](http://omokute.blogspot.com.br/2012/06/emulation-basics-write-your-own-chip-8.html)

# 10. Build your own `Front-end Framework / Library`

* [**JavaScript**: _WTF is JSX (Let's Build a JSX Renderer)_](https://jasonformat.com/wtf-is-jsx/)
* [**JavaScript**: _A DIY guide to build your own React_](https://github.com/hexacta/didact)
* [**JavaScript**: _Reverse Engineering React_](https://vimeo.com/album/3930691) [video]
* [**JavaScript**: _Building React From Scratch_](https://www.youtube.com/watch?v=_MAD4Oly9yg) [video]
* [**JavaScript**: _Building Your Own React Clone in Five Easy Steps_](https://blog.javascripting.com/2016/10/05/building-your-own-react-clone-in-five-easy-steps/)
* [**JavaScript**: _Gooact: React in 160 lines of JavaScript_](https://medium.com/@sweetpalma/gooact-react-in-160-lines-of-javascript-44e0742ad60f)
* [**JavaScript**: _React Internals_](http://www.mattgreer.org/articles/react-internals-part-one-basic-rendering/)
* [**JavaScript**: _Learn how React Reconciler package works by building your own lightweight React DOM_](https://hackernoon.com/learn-you-some-custom-react-renderers-aed7164a4199)
* [**JavaScript**: _Build Yourself a Redux_](https://zapier.com/engineering/how-to-build-redux/)
* [**JavaScript**: _Let’s Write Redux!_](https://www.jamasoftware.com/blog/lets-write-redux/)
* [**JavaScript**: _Redux: Implementing Store from Scratch_](https://egghead.io/lessons/react-redux-implementing-store-from-scratch) [video]
* [**JavaScript**: _Build Your own Simplified AngularJS in 200 Lines of JavaScript_](https://blog.mgechev.com/2015/03/09/build-learn-your-own-light-lightweight-angularjs/)
* [**JavaScript**: _Make Your Own AngularJS_](http://teropa.info/blog/2013/11/03/make-your-own-angular-part-1-scopes-and-digest.html)
* [**JavaScript**: _How to write your own Virtual DOM_](https://medium.com/@deathmood/how-to-write-your-own-virtual-dom-ee74acc13060)
* [**JavaScript**: _Building a frontend framework, from scratch, with components (templating, state, VDOM)_](https://mfrachet.github.io/create-frontend-framework/)
* [**JavaScript**: _Build your own React_](https://pomb.us/build-your-own-react/)
* [**JavaScript**: _Building a Custom React Renderer_](https://youtu.be/CGpMlWVcHok) [video]

# 11. Build your own `Game`

* [**C**: _Handmade Hero_](https://handmadehero.org/)
* [**C**: _How to Program an NES game in C_](https://nesdoug.com/)
* [**C**: _Chess Engine In C_](https://www.youtube.com/playlist?list=PLZ1QII7yudbc-Ky058TEaOstZHVbT-2hg) [video]
* [**C**: _Let's Make: Dangerous Dave_](https://www.youtube.com/playlist?list=PLSkJey49cOgTSj465v2KbLZ7LMn10bCF9) [video]
* [**C**: _Learn Video Game Programming in C_](https://www.youtube.com/playlist?list=PLT6WFYYZE6uLMcPGS3qfpYm7T_gViYMMt)
  [video]
* [**C**: _Coding A Sudoku Solver in C_](https://www.youtube.com/playlist?list=PLkTXsX7igf8edTYU92nU-f5Ntzuf-RKvW) [video]
* [**C**: _Coding a Rogue/Nethack RPG in C_](https://www.youtube.com/playlist?list=PLkTXsX7igf8erbWGYT4iSAhpnJLJ0Nk5G) [video]
* [**C**: _On Tetris and Reimplementation_](https://brennan.io/2015/06/12/tetris-reimplementation/)
* [**C++**: _Breakout_](https://learnopengl.com/In-Practice/2D-Game/Breakout)
* [**C++**: _Beginning Game Programming v2.0_](http://lazyfoo.net/tutorials/SDL/)
* [**C++**: _Tetris tutorial in C++ platform independent focused in game logic for beginners_](http://javilop.com/gamedev/tetris-tutorial-in-c-platform-independent-focused-in-game-logic-for-beginners/)
* [**C++**: _Remaking Cavestory in C++_](https://www.youtube.com/watch?v=ETvApbD5xRo&list=PLNOBk_id22bw6LXhrGfhVwqQIa-M2MsLa) [video]
* [**C++**: _Reconstructing Cave Story_](https://www.youtube.com/playlist?list=PL006xsVEsbKjSKBmLu1clo85yLrwjY67X) [video]
* [**C++**: _Space Invaders from Scratch_](http://nicktasios.nl/posts/space-invaders-from-scratch-part-1.html)
* [**C#**: _Learn C# by Building a Simple RPG_](http://scottlilly.com/learn-c-by-building-a-simple-rpg-index/)
* [**C#**: _Creating a Roguelike Game in C#_](https://roguesharp.wordpress.com/)
* [**C#**: _Build a C#/WPF RPG_](https://scottlilly.com/build-a-cwpf-rpg/)
* [**Go**: _Games With Go_](https://gameswithgo.org/) [video]
* [**Java**: _3D Game Development with LWJGL 3_](https://lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content/)
* [**JavaScript**: _2D breakout game using Phaser_](https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_breakout_game_Phaser)
* [**JavaScript**: _How to Make Flappy Bird in HTML5 With Phaser_](http://www.lessmilk.com/tutorial/flappy-bird-phaser-1)
* [**JavaScript**: _Developing Games with React, Redux, and SVG_](https://auth0.com/blog/developing-games-with-react-redux-and-svg-part-1/)
* [**JavaScript**: _Build your own 8-Ball Pool game from scratch_](https://www.youtube.com/watch?v=aXwCrtAo4Wc) [video]
* [**JavaScript**: _How to Make Your First Roguelike_](https://gamedevelopment.tutsplus.com/tutorials/how-to-make-your-first-roguelike--gamedev-13677)
* [**JavaScript**: _Think like a programmer: How to build Snake using only JavaScript, HTML & CSS_](https://medium.freecodecamp.org/think-like-a-programmer-how-to-build-snake-using-only-javascript-html-and-css-7b1479c3339e)
* [**Lua**: _BYTEPATH_](https://github.com/SSYGEN/blog/issues/30)
* [**Python**: _Developing Games With PyGame_](https://pythonprogramming.net/pygame-python-3-part-1-intro/)
* [**Python**: _Making Games with Python & Pygame_](https://inventwithpython.com/makinggames.pdf) [pdf]
* [**Python**: _The Complete Roguelike Tutorial_](https://www.youtube.com/playlist?list=PLKUel_nHsTQ1yX7tQxR_SQRdcOFyXfNAb) [video]
* [**Python**: _Roguelike Tutorial Revised_](http://rogueliketutorials.com/)
* [**Ruby**: _Developing Games With Ruby_](https://leanpub.com/developing-games-with-ruby/read)
* [**Ruby**: _Ruby Snake_](https://www.diatomenterprises.com/gamedev-on-ruby-why-not/)
* [**Rust**: _Adventures in Rust: A Basic 2D Game_](https://a5huynh.github.io/posts/2018/adventures-in-rust/)
* [**Rust**: _Roguelike Tutorial in Rust + tcod_](https://tomassedovic.github.io/roguelike-tutorial/)

# 12. Build your own `Git`

* [**Haskell**: _Reimplementing “git clone” in Haskell from the bottom up_](http://stefan.saasen.me/articles/git-clone-in-haskell-from-the-bottom-up/)
* [**JavaScript**: _Gitlet_](http://gitlet.maryrosecook.com/docs/gitlet.html)
* [**JavaScript**: _Build GIT - Learn GIT_](https://kushagragour.in/blog/2014/01/build-git-learn-git/)
* [**Python**: _Just enough of a Git client to create a repo, commit, and push itself to GitHub_](https://benhoyt.com/writings/pygit/)
* [**Python**: _Write yourself a Git!_](https://wyag.thb.lt/)
* [**Ruby**: _Rebuilding Git in Ruby_](https://robots.thoughtbot.com/rebuilding-git-in-ruby)

# 13. Build your own `Network Stack`

* [**C**: _Beej's Guide to Network Programming_](http://beej.us/guide/bgnet/)
* [**C**: _Let's code a TCP/IP stack_](http://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-arp/)
* [**Ruby**: _How to build a network stack in Ruby_](https://medium.com/geckoboard-under-the-hood/how-to-build-a-network-stack-in-ruby-f73aeb1b661b)

# 14. Build your own `Neural Network`

* [**C#**: _Neural Network OCR_](https://www.codeproject.com/Articles/11285/Neural-Network-OCR)
* [**F#**: _Building Neural Networks in F#_](https://towardsdatascience.com/building-neural-networks-in-f-part-1-a2832ae972e6)
* [**Go**: _Build a multilayer perceptron with Golang_](https://made2591.github.io/posts/neuralnetwork)
* [**Go**: _How to build a simple artificial neural network with Go_](https://sausheong.github.io/posts/how-to-build-a-simple-artificial-neural-network-with-go/)
* [**Go**: _Building a Neural Net from Scratch in Go_](https://datadan.io/blog/neural-net-with-go)
* [**JavaScript / Java**: _Neural Networks - The Nature of Code_](https://www.youtube.com/playlist?list=PLRqwX-V7Uu6aCibgK1PTWWu9by6XFdCfh) [video]
* [**JavaScript**: _Neural Network implementation in JavaScript, by an example_](https://franpapers.com/en/machine-learning-ai-en/2017-neural-network-implementation-in-javascript-by-an-example/)
* [**JavaScript**: _Neural networks from scratch for JavaScript linguists (Part1 — The Perceptron)_](https://hackernoon.com/neural-networks-from-scratch-for-javascript-linguists-part1-the-perceptron-632a4d1fbad2)
* [**Python**: _A Neural Network in 11 lines of Python_](https://iamtrask.github.io/2015/07/12/basic-python-network/)
* [**Python**: _Implement a Neural Network from Scratch_](https://victorzhou.com/blog/intro-to-neural-networks/)
* [**Python**: _Optical Character Recognition (OCR)_](http://aosabook.org/en/500L/optical-character-recognition-ocr.html)
* [**Python**: _Traffic signs classification with a convolutional network_](https://navoshta.com/traffic-signs-classification/)
* [**Python**: _Generate Music using LSTM Neural Network in Keras_](https://towardsdatascience.com/how-to-generate-music-using-a-lstm-neural-network-in-keras-68786834d4c5)
* [**Python**: _An Introduction to Convolutional Neural Networks_](https://victorzhou.com/blog/intro-to-cnns-part-1/)

# 15. Build your own `Operating System`

* [**Assembly**: _Writing a Tiny x86 Bootloader_](http://joebergeron.io/posts/post_two.html)
* [**Assembly**: _Baking Pi – Operating Systems Development_](http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/index.html)
* [**C**: _Building a software and hardware stack for a simple computer from scratch_](https://www.youtube.com/watch?v=ZjwvMcP3Nf0&list=PLU94OURih-CiP4WxKSMt3UcwMSDM3aTtX) [video]
* [**C**: _Operating Systems: From 0 to 1_](https://tuhdo.github.io/os01/)
* [**C**: _The little book about OS development_](https://littleosbook.github.io/)
* [**C**: _Roll your own toy UNIX-clone OS_](http://jamesmolloy.co.uk/tutorial_html/)
* [**C**: _Kernel 101 – Let’s write a Kernel_](https://arjunsreedharan.org/post/82710718100/kernel-101-lets-write-a-kernel)
* [**C**: _Kernel 201 – Let’s write a Kernel with keyboard and screen support_](https://arjunsreedharan.org/post/99370248137/kernel-201-lets-write-a-kernel-with-keyboard)
* [**C**: _Build a minimal multi-tasking kernel for ARM from scratch_](https://github.com/jserv/mini-arm-os)
* [**C**: _How to create an OS from scratch_](https://github.com/cfenollosa/os-tutorial)
* [**C**: _Malloc tutorial_](https://danluu.com/malloc-tutorial/)
* [**C**: _Hack the virtual memory_](https://blog.holbertonschool.com/hack-the-virtual-memory-c-strings-proc/)
* [**C**: _Learning operating system development using Linux kernel and Raspberry Pi_](https://github.com/s-matyukevich/raspberry-pi-os)
* [**C**: _Operating systems development for Dummies_](https://medium.com/@lduck11007/operating-systems-development-for-dummies-3d4d786e8ac)
* [**C++**: _Write your own Operating System_](https://www.youtube.com/playlist?list=PLHh55M_Kq4OApWScZyPl5HhgsTJS9MZ6M) [video]
* [**C++**: _Writing a Bootloader_](http://3zanders.co.uk/2017/10/13/writing-a-bootloader/)
* [**Rust**: _Writing an OS in Rust_](https://os.phil-opp.com/)

# 16. Build your own `Physics Engine`

* [**C**: _Video Game Physics Tutorial_](https://www.toptal.com/game/video-game-physics-part-i-an-introduction-to-rigid-body-dynamics)
* [**C++**: _Game physics series by Allen Chou_](http://allenchou.net/game-physics-series/)
* [**C++**: _How to Create a Custom Physics Engine_](https://gamedevelopment.tutsplus.com/series/how-to-create-a-custom-physics-engine--gamedev-12715)
* [**C++**: _3D Physics Engine Tutorial_](https://www.youtube.com/playlist?list=PLEETnX-uPtBXm1KEr_2zQ6K_0hoGH6JJ0) [video]
* [**JavaScript**: _Build your own basic physics engine in JavaScript_](https://www.graphitedigital.com/blog/build-your-own-basic-physics-engine-in-javascript)
* [**JavaScript**: _How Physics Engines Work_](http://buildnewgames.com/gamephysics/)
* [**JavaScript**: _Broad Phase Collision Detection Using Spatial Partitioning_](http://buildnewgames.com/broad-phase-collision-detection/)
* [**JavaScript**: _Build a simple 2D physics engine for JavaScript games_](https://www.ibm.com/developerworks/library/wa-build2dphysicsengine/index.html)

# 18. Build your own `Programming Language`

* [**(any)**: _mal - Make a Lisp_](https://github.com/kanaka/mal#mal---make-a-lisp)
* [**Assembly**: _Jonesforth_](https://github.com/nornagon/jonesforth/blob/master/jonesforth.S)
* [**C**: _Baby's First Garbage Collector_](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_](http://www.buildyourownlisp.com/)
* [**C**: _Writing a Simple Garbage Collector in C_](http://maplant.com/gc.html)
* [**C**: _C interpreter that interprets itself._](https://github.com/lotabout/write-a-C-interpreter)
* [**C**: _A C & x86 version of the "Let's Build a Compiler" by Jack Crenshaw_](https://github.com/lotabout/Let-s-build-a-compiler)
* [**C**: _A journey explaining how to build a compiler from scratch_](https://github.com/DoctorWkt/acwj)
* [**C++**: _Writing Your Own Toy Compiler Using Flex_](https://gnuu.org/2009/09/18/writing-your-own-toy-compiler/)
* [**C++**: _How to Create a Compiler_](https://www.youtube.com/watch?v=eF9qWbuQLuw) [video]
* [**C++**: _Kaleidoscope: Implementing a Language with LLVM_](https://llvm.org/docs/tutorial/MyFirstLanguageFrontend/index.html)
* [**F#**: _Understanding Parser Combinators_](https://fsharpforfunandprofit.com/posts/understanding-parser-combinators/)
* [**Elixir**: _Demystifying compilers by writing your own_](https://www.youtube.com/watch?v=zMJYoYwOCd4) [video]
* [**Go**: _The Super Tiny Compiler_](https://github.com/hazbo/the-super-tiny-compiler)
* [**Go**: _Lexical Scanning in Go_](https://www.youtube.com/watch?v=HxaD_trXwRE) [video]
* [**Haskell**: _Let's Build a Compiler_](https://g-ford.github.io/cradle/)
* [**Haskell**: _Write You a Haskell_](http://dev.stephendiehl.com/fun/)
* [**Haskell**: _Write Yourself a Scheme in 48 Hours_](https://en.wikibooks.org/wiki/Write_Yourself_a_Scheme_in_48_Hours)
* [**Haskell**: _Write You A Scheme_](https://www.wespiser.com/writings/wyas/home.html)
* [**Java**: _Crafting interpreters: A handbook for making programming languages_](http://www.craftinginterpreters.com/)
* [**Java**: _Creating JVM Language_](http://jakubdziworski.github.io/categories.html#Enkel-ref)
* [**JavaScript**: _The Super Tiny Compiler_](https://github.com/jamiebuilds/the-super-tiny-compiler)
* [**JavaScript**: _The Super Tiny Interpreter_](https://github.com/keyanzhang/the-super-tiny-interpreter)
* [**JavaScript**: _Little Lisp interpreter_](https://maryrosecook.com/blog/post/little-lisp-interpreter)
* [**JavaScript**: _How to implement a programming language in JavaScript_](http://lisperator.net/pltut/)
* [**OCaml**: _Writing a C Compiler_](https://norasandler.com/2017/11/29/Write-a-Compiler.html)
* [**OCaml**: _Writing a Lisp, the series_](https://bernsteinbear.com/blog/lisp/)
* [**Pascal**: _Let's Build a Compiler_](https://compilers.iecc.com/crenshaw/)
* [**Python**: _A Python Interpreter Written in Python_](http://aosabook.org/en/500L/a-python-interpreter-written-in-python.html)
* [**Python**: _lisp.py: Make your own Lisp interpreter_](http://khamidou.com/compilers/lisp.py/)
* [**Python**: _Simple Iterator-based Parsing_](http://effbot.org/zone/simple-iterator-parser.htm)
* [**Python**: _Simple Top-Down Parsing in Python_](http://effbot.org/zone/simple-top-down-parsing.htm)
* [**Python**: _How to Write a Lisp Interpreter in Python_](http://norvig.com/lispy.html)
* [**Python**: _Let’s Build A Simple Interpreter_](https://ruslanspivak.com/lsbasi-part1/)
* [**Python**: _Make Your Own Simple Interpreted Programming Language_](https://www.youtube.com/watch?v=dj9CBS3ikGA&list=PLZQftyCk7_SdoVexSmwy_tBgs7P0b97yD&index=1) [video]
* [**Racket**: _Beautiful Racket: How to make your own programming languages with Racket_](https://beautifulracket.com/)
* [**Ruby**: _A Compiler From Scratch_](https://www.destroyallsoftware.com/screencasts/catalog/a-compiler-from-scratch)
* [**Ruby**: _Markdown compiler from scratch in Ruby_](https://blog.beezwax.net/2017/07/07/writing-a-markdown-compiler/)
* [**Rust**: _So You Want to Build a Language VM_](https://blog.subnetzero.io/post/building-language-vm-part-00/)
* [**Rust**: _Learning Parser Combinators With Rust_](https://bodil.lol/parser-combinators/)
* [**Swift**: _Building a LISP from scratch with Swift_](https://www.uraimo.com/2017/02/05/building-a-lisp-from-scratch-with-swift/)
* [**TypeScript**: _Build your own WebAssembly Compiler_](https://blog.scottlogic.com/2019/05/17/webassembly-compiler.html)

# 19. Build your own `Regex Engine`

* [**C**: _A Regular Expression Matcher_](https://www.cs.princeton.edu/courses/archive/spr09/cos333/beautiful.html)
* [**C**: _Regular Expression Matching Can Be Simple And Fast_](https://swtch.com/~rsc/regexp/regexp1.html)
* [**JavaScript**: _Build a Regex Engine in Less than 40 Lines of Code_](https://nickdrane.com/build-your-own-regex/)
* [**JavaScript**: _How to implement regular expressions in functional javascript using derivatives_](http://dpk.io/dregs/toydregs)
* [**JavaScript**: Implementing a Regular Expression Engine](https://deniskyashif.com/2019/02/17/implementing-a-regular-expression-engine/) 
* [**Perl**: _How Regexes Work_](https://perl.plover.com/Regex/article.html)
* [**Scala**: _No Magic: Regular Expressions_](https://rcoh.svbtle.com/no-magic-regular-expressions)

# 20. Build your own `Search Engine`

* [**CSS**: _A search engine in CSS_](https://stories.algolia.com/a-search-engine-in-css-b5ec4e902e97)
* [**Python**: _Building a search engine using Redis and redis-py_](http://www.dr-josiah.com/2010/07/building-search-engine-using-redis-and.html)
* [**Python**: _Building a Vector Space Indexing Engine in Python_](https://boyter.org/2010/08/build-vector-space-search-engine-python/)
* [**Python**: _Building A Python-Based Search Engine_](https://www.youtube.com/watch?v=cY7pE7vX6MU) [video]
* [**Python**: _Making text search learn from feedback_](https://medium.com/filament-ai/making-text-search-learn-from-feedback-4fe210fd87b0)
* [**Python**: _Finding Important Words in Text Using TF-IDF_](https://stevenloria.com/tf-idf/)

# 21. Build your own `Shell`

* [**C**: _Tutorial - Write a Shell in C_](https://brennan.io/2015/01/16/write-a-shell-in-c/)
* [**C**: _Let's build a shell!_](https://github.com/kamalmarhubi/shell-workshop)
* [**C**: _Writing a UNIX Shell_](https://indradhanush.github.io/blog/writing-a-unix-shell-part-1/)
* [**C**: _Build Your Own Shell_](https://github.com/tokenrove/build-your-own-shell)
* [**Go**: _Writing a simple shell in Go_](https://sj14.gitlab.io/post/2018-07-01-go-unix-shell/)
* [**Ruby**: _A Unix Shell in Ruby_](https://www.jstorimer.com/blogs/workingwithcode/7766107-a-unix-shell-in-ruby)
* [**Rust**: _Build Your Own Shell using Rust_](https://www.joshmcguigan.com/blog/build-your-own-shell-rust/)

# 22. Build your own `Template Engine`

* [**JavaScript**: _JavaScript template engine in just 20 lines_](http://krasimirtsonev.com/blog/article/Javascript-template-engine-in-just-20-line)
* [**JavaScript**: _Understanding JavaScript Micro-Templating_](https://medium.com/wdstack/understanding-javascript-micro-templating-f37a37b3b40e)
* [**Python**: _Approach: Building a toy template engine in Python_](http://alexmic.net/building-a-template-engine/)
* [**Python**: _A Template Engine_](http://aosabook.org/en/500L/a-template-engine.html)
* [**Ruby**: _How to write a template engine in less than 30 lines of code_](http://bits.citrusbyte.com/how-to-write-a-template-library/)

# 23. Build your own `Text Editor`

* [**C**: _Build Your Own Text Editor_](https://viewsourcecode.org/snaptoken/kilo/)
* [**C++**: _Designing a Simple Text Editor_](http://www.fltk.org/doc-1.1/editor.html)
* [**Python**: _Python Tutorial: Make Your Own Text Editor_](https://www.youtube.com/watch?v=xqDonHEYPgA) [video]
* [**Python**: _Create a Simple Python Text Editor!_](http://www.instructables.com/id/Create-a-Simple-Python-Text-Editor/)
* [**Ruby**: _Build a Collaborative Text Editor Using Rails_](https://blog.aha.io/text-editor/)

# 24. Build your own `Visual Recognition System`

* [**Python**: _Developing a License Plate Recognition System with Machine Learning in Python_](https://blog.devcenter.co/developing-a-license-plate-recognition-system-with-machine-learning-in-python-787833569ccd)
* [**Python**: _Building a Facial Recognition Pipeline with Deep Learning in Tensorflow_](https://hackernoon.com/building-a-facial-recognition-pipeline-with-deep-learning-in-tensorflow-66e7645015b8)

# 25. Build your own `Voxel Engine`

* [**C++**: _Let's Make a Voxel Engine_](https://sites.google.com/site/letsmakeavoxelengine/home)
* [**Java**: _Let's make a voxel engine_](https://www.youtube.com/watch?v=C_Fo9PcrVXA&list=PLXa65xzz2vplye7cn1HH4GyE6_FjnDSug&index=1) [video]
* [**Java**: _Java Voxel Engine Tutorial_](https://www.youtube.com/watch?v=QZ4Vk2PkPZk&list=PL80Zqpd23vJfyWQi-8FKDbeO_ZQamLKJL) [video]

# 26. Build your own `Web Search Engine`

* [**PHP**: _Code a Search Engine in PHP_](https://boyter.org/2013/01/code-for-a-search-engine-in-php-part-1/)

# 27. Build your own `Web Server`

* [**C#**: _Writing a Web Server from Scratch_](https://www.codeproject.com/Articles/859108/Writing-a-Web-Server-from-Scratch)
* [**Node.js**: _Let's code a web server from scratch with NodeJS Streams_](https://www.codementor.io/ziad-saab/let-s-code-a-web-server-from-scratch-with-nodejs-streams-h4uc9utji)
* [**Node.js**: _lets-build-express_](https://github.com/antoaravinth/lets-build-express)
* [**PHP**: _Writing a webserver in pure PHP_](http://station.clancats.com/writing-a-webserver-in-pure-php/)
* [**Python**: _A Simple Web Server_](http://aosabook.org/en/500L/a-simple-web-server.html)
* [**Python**: _Let’s Build A Web Server._](https://ruslanspivak.com/lsbaws-part1/)
* [**Python**: _Web application from scratch_](https://defn.io/2018/02/25/web-app-from-scratch-01/)
* [**Python**: _Building a basic HTTP Server from scratch in Python_](http://joaoventura.net/blog/2017/python-webserver/)
* [**Python**: _Implementing a RESTful Web API with Python & Flask_](http://blog.luisrei.com/articles/flaskrest.html)
* [**Ruby**: _Building a simple websockets server from scratch in Ruby_](http://blog.honeybadger.io/building-a-simple-websockets-server-from-scratch-in-ruby/)


# 28. Uncategorized

* [**(any)**: _From NAND to Tetris: Building a Modern Computer From First Principles_](http://nand2tetris.org/)
* [**Alloy**: _The Same-Origin Policy_](http://aosabook.org/en/500L/the-same-origin-policy.html)
* [**C**: _How to Write a Video Player in Less Than 1000 Lines_](http://dranger.com/ffmpeg/ffmpeg.html)
* [**C**: _Learn how to write a hash table in C_](https://github.com/jamesroutley/write-a-hash-table)
* [**C**: _The very basics of a terminal emulator_](https://www.uninformativ.de/blog/postings/2018-02-24/0/POSTING-en.html)
* [**C**: _Write a System Call_](https://brennan.io/2016/11/14/kernel-dev-ep3/)
* [**C**: _Sol - An MQTT broker from scratch_](https://codepr.github.io/posts/sol-mqtt-broker)
* [**C++**: _Build your own VR headset for $100_](https://github.com/relativty/Relativ)
* [**C++**: _How X Window Managers work and how to write one_](https://seasonofcode.com/posts/how-x-window-managers-work-and-how-to-write-one-part-i.html)
* [**C++**: _Writing a Linux Debugger_](https://blog.tartanllama.xyz/writing-a-linux-debugger-setup/)
* [**C++**: _How a 64k intro is made_](http://www.lofibucket.com/articles/64k_intro.html)
* [**C#**: _C# Networking: Create a TCP chater server, TCP games, UDP Pong and more_](https://16bpp.net/tutorials/csharp-networking)
* [**C#**: _Loading and rendering 3D skeletal animations from scratch in C# and GLSL_](https://www.seanjoflynn.com/research/skeletal-animation.html)
* [**Clojure**: _Building a spell-checker_](https://bernhardwenzel.com/articles/clojure-spellchecker/)
* [**Go**, _Let's Create a Simple Load Balancer_](https://kasvith.github.io/posts/lets-create-a-simple-lb-go/)
* [**Java**: _How to Build an Android Reddit App_](https://www.youtube.com/playlist?list=PLgCYzUzKIBE9HUJU-upNvl3TRVAo9W47y) [video]
* [**JavaScript**: _Build Your Own Module Bundler - Minipack_](https://github.com/ronami/minipack)
* [**JavaScript**: _Learn JavaScript Promises by Building a Promise from Scratch_](https://levelup.gitconnected.com/understand-javascript-promises-by-building-a-promise-from-scratch-84c0fd855720)
* [**JavaScript**: _Implementing promises from scratch (TDD way)_](https://www.mauriciopoppe.com/notes/computer-science/computation/promises/)
* [**JavaScript**: _Implement your own — call(), apply() and bind() method in JavaScript_](https://blog.usejournal.com/implement-your-own-call-apply-and-bind-method-in-javascript-42cc85dba1b)
* [**JavaScript**: _JavaScript Algorithms and Data Structures_](https://github.com/trekhleb/javascript-algorithms)
* [**JavaScript**: _How to Make an Evolutionary Tetris AI_](https://www.youtube.com/watch?v=xLHCMMGuN0Q) [video]
* [**JavaScript**: _Build a ride hailing app with React Native_](https://pusher.com/tutorials/ride-hailing-react-native)
* [**Kotlin**: _Build Your Own Cache_](https://github.com/kezhenxu94/cache-lite)
* [**Nim**: _Writing a Redis Protocol Parser_](https://xmonader.github.io/nimdays/day12_resp.html)
* [**Nim**: _Writing a Build system_](https://xmonader.github.io/nimdays/day11_buildsystem.html)
* [**Nim**: _Writing a MiniTest Framework_](https://xmonader.github.io/nimdays/day08_minitest.html)
* [**Nim**: _Writing a DMIDecode Parser_](https://xmonader.github.io/nimdays/day01_dmidecode.html)
* [**Nim**: _Writing a INI Parser_](https://xmonader.github.io/nimdays/day05_iniparser.html)
* [**Nim**: _Writing a Link Checker_](https://xmonader.github.io/nimdays/day04_asynclinkschecker.html)
* [**Nim**: _Writing a URL Shortening Service_](https://xmonader.github.io/nimdays/day07_shorturl.html)
* [**Node.js**: _Build a static site generator in 40 lines with Node.js_](https://www.webdevdrops.com/build-static-site-generator-nodejs-8969ebe34b22/)
* [**Node.js**: _Building A Simple Single Sign On(SSO) Server And Solution From Scratch In Node.js._](https://codeburst.io/building-a-simple-single-sign-on-sso-server-and-solution-from-scratch-in-node-js-ea6ee5fdf340)
* [**Node.js**: _How to create a real-world Node CLI app with Node_](https://medium.freecodecamp.org/how-to-create-a-real-world-node-cli-app-with-node-391b727bbed3)
* [**PHP**: _Write your own MVC from scratch in PHP_ ](https://chaitya62.github.io/2018/04/29/Writing-your-own-MVC-from-Scratch-in-PHP.html)
* [**PHP**: _Make your own blog_](https://ilovephp.jondh.me.uk/en/tutorial/make-your-own-blog)
* [**PHP**: _Modern PHP Without a Framework_](https://kevinsmith.io/modern-php-without-a-framework)
* [**Python**: _Build a Deep Learning Library_](https://www.youtube.com/watch?v=o64FV-ez6Gw) [video]
* [**Python**: _How to Build a Kick-Ass Mobile Document Scanner in Just 5 Minutes_](https://www.pyimagesearch.com/2014/09/01/build-kick-ass-mobile-document-scanner-just-5-minutes/)
* [**Python**: _Continuous Integration System_](http://aosabook.org/en/500L/a-continuous-integration-system.html)
* [**Python**: _Recommender Systems in Python: Beginner Tutorial_](https://www.datacamp.com/community/tutorials/recommender-systems-python)
* [**Python**: _Write SMS-spam detector with Scikit-learn_](https://medium.com/@kopilov.vlad/detect-sms-spam-in-kaggle-with-scikit-learn-5f6afa7a3ca2)
* [**Python**: _A Simple Content-Based Recommendation Engine in Python_](http://blog.untrod.com/2016/06/simple-similar-products-recommendation-engine-in-python.html)
* [**Python**: _Stock Market Predictions with LSTM in Python_](https://www.datacamp.com/community/tutorials/lstm-python-stock-market)
* [**Python**: _Build your own error-correction fountain code with Luby Transform Codes_](https://franpapers.com/en/algorithmic/2018-introduction-to-fountain-codes-lt-codes-with-python/)
* [**Python**: _Building a simple Generative Adversial Network (GAN) using Tensorflow_](https://blog.paperspace.com/implementing-gans-in-tensorflow/)
* [**Python**: _Learn ML Algorithms by coding: Decision Trees_](https://lethalbrains.com/learn-ml-algorithms-by-coding-decision-trees-439ac503c9a4)
* [**Python**: _JSON Decoding Algorithm_](https://github.com/cheery/json-algorithm)
* [**Ruby**: _A Pedometer in the Real World_](http://aosabook.org/en/500L/a-pedometer-in-the-real-world.html)
* [**Ruby**: _Creating a Linux Desktop application with Ruby_](https://iridakos.com/tutorials/2018/01/25/creating-a-gtk-todo-application-with-ruby)
* [**Rust**: _Let's build a browser engine_](https://limpet.net/mbrubeck/2014/08/08/toy-layout-engine-1.html)
* [**Rust**: _Building a DNS server in Rust_](https://github.com/EmilHernvall/dnsguide/blob/master/README.md)
* [**Rust**: _Writing Scalable Chat Service from Scratch_](https://nbaksalyar.github.io/2015/07/10/writing-chat-in-rust.html)
* [**TypeScript**: _Tiny Package Manager: Learns how npm or Yarn works_](https://github.com/g-plane/tiny-package-manager)

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