Build your own
Guides or code that rebuild a known tool, such as a database or Git, from scratch to teach how it works.
Repositories
15
Net stars gained, last 7 days
+3,851
Top-level Tag
Net stars gained each day, last 90 days
Peak days
- 1
Aug 7, 2026 +1,022 net stars (median day +459)
- codecrafters-io/build-your-own-x+612 (60%)
- rasbt/LLMs-from-scratch+327 (32%)
- shareAI-lab/learn-claude-code+71 (7%)
- 2
Aug 8, 2026 +952 net stars (median day +459)
- rasbt/LLMs-from-scratch+563 (59%)
- codecrafters-io/build-your-own-x+314 (33%)
- shareAI-lab/learn-claude-code+63 (7%)
- 3
Aug 9, 2026 +982 net stars (median day +459)
- rasbt/LLMs-from-scratch+536 (55%)
- codecrafters-io/build-your-own-x+318 (32%)
- shareAI-lab/learn-claude-code+117 (12%)
- 4
Oct 13, 2026 +1,007 net stars (median day +459)
- codecrafters-io/build-your-own-x+267 (27%)
- shareAI-lab/learn-claude-code+78 (8%)
A peak day has at least 2 times the net stars of the median day of this chart, and at least 100 more. For each peak day, the list shows the repositories that gained the most net stars that day. It also shows their GitHub releases of that day or the day before (UTC), and their creation date when it was 14 days or less before. These events occur near the same day. They do not show why the stars came.
Largest
Most stars in total now.
readme:
This repository is a compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch.
description:
Implement a ChatGPT-like LLM in PyTorch from scratch, step by step
description:
A nano claude code–like 「agent harness」, built from 0 to 1
description:
How to create an OS from scratch!
readme:
This is an ultra-simplified example of all the major pieces of a modern compiler written in easy to read JavaScript.
readme:
In this series of articles, I aim to demonstrate how OpenGL, Vulkan, Metal, and DirectX work by writing a simplified clone from scratch.
readme:
Online book about how to write a computer operating system in C/C++ from scratch.
description:
7 days golang programs from scratch
readme:
The tutorials will give a guided, step-by-step tour of how to write a [monolithic] Operating System `kernel` for an `embedded system` from scratch.
readme:
This repository contains a step-by-step guide that teaches how to create a simple operating system (OS) kernel from scratch.
Newest Admissions
Entered the index by the rising rule, newest first.
description:
Build GPT-2 from scratch in PyTorch, step by step
description:
build a mini-sglang from scratch, then read the real SGLang source.
readme:
Implementing LLM architectures from scratch for deep understanding of modern LLM architectures.
readme:
Every operation traces back to raw NumPy, the architecture matches what production frameworks use, and there is no `import torch` anywhere in the curriculum.
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