x-in-y-lines

Succintly written (<1000 non-obfuscated loc), fully-functional software in any language.

Databases

• Pydis – Redis clone in 250 lines of Python, for performance comparison link
• SQL query builder in 150 lines of Python link
• A functional, relational database in about 250 lines of Common Lisp link
• A mini redis in 411 lines of Python link

Version Control

• Gitlet.js – Git implemented in 1k lines of JS link

Text Editors

• A small text editor in less than 1K lines of C link

Spreadsheets / Calculators

• A spreadsheet in fewer than 30 lines of JavaScript, no library used link

WWW / Networks

• Strace in 60 lines of Go link
• Traceroute, 71 lines, Python link
• News Scraper with 100 Lines of Python link
• A bare-bones but usable Gemini client in 100 lines of Python link
• A bare-bones but usable Gemini client in 100 lines of Lua link
• A bare-bones but usable Gemini client almost 100 lines of Go link

Games / Graphics

• Simple Minecraft Clone in 580 lines of Python link
• snake in 12 lines of Pytorch link
• Pokemon game in 70 lines of Javascript link
• A first-person engine in 265 lines of JS link
• Sunfish: A simple but strong chess engine in 111 lines of Python link
• Recursive raytracer in 35 lines of JavaScript link
• A top-down 2d game engine, written from scratch in under 1000 lines of C link
• Tile map editor in 70 lines of JavaScript link

Emulators

• LaiNES – Cycle-accurate NES emulator in around 1000 lines of C++/SDL link

Engines/Frameworks

• State-of-the-art (ranked #1 Aug 2022) German Speech Recognition in 284 lines of C++ link
• C++: How OpenGL works: software rendering in 500 lines of code link
• JavaScript: Gooact: React in 160 lines of JavaScript link
• JavaScript: Build Your own Simplified AngularJS in 200 Lines of JavaScript link
• JavaScript: Build a Regex Engine in Less than 40 Lines of Code link
• JavaScript: JavaScript template engine in just 20 lines link
• Ruby: How to write a template engine in less than 30 lines of code link
• Node.js: Build a static site generator in 40 lines with Node.js link
• A React (+ Redux) replacement in 40 lines of code link
• Building a full-text search engine in 150 lines of Python code link
• Noact – React-like Virtual DOM library in 70 lines of TypeScript link

Cryptocurrency

• Go: Code your own blockchain in less than 200 lines of Go link
• JavaScript: A cryptocurrency implementation in less than 1500 lines of code link
• Make an NFT in 15 Lines of Solidity link

Cryptography

• Minimal TOTP generator in 20 lines of Python link

Containers

• C: Linux containers in 500 lines of code link
• Go: Build Your Own Container Using Less than 100 Lines of Go link
• Shell: Docker implemented in around 100 lines of bash link

AI/ML

• Python: A Neural Network in 11 lines of Python link
• Abstractive Text Summarizer in 94 Lines of Tensorflow link
• Parsing English with 500 lines of Python link

Compilers / Interpreters / Languages

• A programming language in 450 lines of JavaScript link
• C: Build Your Own Lisp: Learn C and build your own programming language in 1000 lines of code link
• C subset lexer, parser, code generator, and VM in 291 lines of C link
• A simple parser for mathematical expressions in 26 lines of Python link hn thread
• Self-hosting Lisp-to-C compiler in 384 lines of Lisp link
• Regular expression engine in 14 lines of Python link
• Lisp compiler in 89 lines of Python link
• An extensible multi-markup reader in less than 100 lines of python code link
• A λ-calculus interpreter in less than 300 lines of JavaScript link
• Casual Markdown - a regex based markdown parser in less than 190 lines of JavaScript link
• Snarkdown - another regex based markdown parser in 109 lines of JS link

Video

• C: How to Write a Video Player in Less Than 1000 Lines link