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Top 23 HacktoberFest Open-Source Projects
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Free Programming Books
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Project mention: Stop Hoarding Junk Code! Your Algorithm Learning Bible Awaits | dev.to | 2025-09-01
git clone https://github.com/TheAlgorithms/Python.git cd Python
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Mentioned in Awesome Go
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transformers
🤗 Transformers: the model-definition framework for state-of-the-art machine learning models in text, vision, audio, and multimodal models, for both inference and training.
Project mention: The $100 ChatGPT: Why Karpathy's nanochat Represnts the Next Big Thing | dev.to | 2026-05-04Hugging Face Transformers: 500,000+ lines
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Project mention: Your Architecture Diagram Is a Screenshot. Your AI Agent Can't Read It. | dev.to | 2026-05-31
The format idea costs you nothing to adopt today: export from excalidraw.com with "Embed scene" on, commit the .excalidraw.png, reference it as a normal image. It renders everywhere and stays editable.
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Project mention: Spine v1: Stop Making Claude Rediscover Your Codebase Every Time You Open a Repo | dev.to | 2026-05-02
git clone https://github.com/axios/axios.git cd axios
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Windows Terminal
The new Windows Terminal and the original Windows console host, all in the same place!
>I doubt that people think it's the engineering teams that are the problem
Did you forget Microsoft engineering response to Casey Muratori "Extremely slow performance when processing virtual terminal sequences"?
"I believe what you’re doing is describing something that might be considered an entire doctoral research project in performant terminal emulation as “extremely simple” somewhat combatively."
https://github.com/microsoft/terminal/issues/10362#issuecomm...
followed by Casey producing evidence for his 'extremely simple' claim in couple of days.
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Material UI
Ready-to-use foundational React components, free forever. It includes Material UI, which implements Google's Material Design.
Project mention: Show HN: Typique – a bundler-independent, zero-runtime CSS-in-TS library | news.ycombinator.com | 2026-01-07Hi HN! I’ve been following zero-runtime CSS-in-JS/TS libraries for a while and noticed that most of them end up overwhelmed by bundler compatibility issues. A good summary of these problems is in the final status report [1] of Pigment CSS — MUI’s attempt in this space.
As someone working on TypeScript tooling, I started wondering whether this problem could be approached from a different angle: instead of relying on bundler plugins, use TypeScript types to define styles, and TypeScript tooling to provide locally scoped class and CSS variable names.
This led to Typique — a library built as a TypeScript plugin. It provides IDE integration (completion, diagnostics, quick fixes) and emits plain CSS without any dependence on bundler or framework. It’s early, but already usable; I’ve been using it in a couple of personal projects.
Feedback, questions, and skepticism are very welcome. Thanks for reading.
[1] https://github.com/mui/material-ui/issues/45759#issuecomment...
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Home Assistant
:house_with_garden: Open source home automation that puts local control and privacy first.
https://www.home-assistant.io/
the interface can be set up on her phone, a tablet on a wall, and limiting things to giant buttons and displays is very easy for you.
And, you can monitor and be alerted near real time to issues of course.
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Wow, it's actually real.
https://old.reddit.com/r/github/comments/1at9br4/i_am_new_to...
https://github.com/sherlock-project/sherlock/issues/2011
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Project mention: Amazon is discontinuing Kindle for PC on June 30th | news.ycombinator.com | 2026-04-18
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PayloadsAllTheThings
A list of useful payloads and bypass for Web Application Security and Pentest/CTF
if you've never worked on SQL injection that's fine there is a PWNSOME REPOSITORY(get it? pwn + awesome) called[ Payload All The Things (https://github.com/swisskyrepo/PayloadsAllTheThings) it has different payloads for different web vulnerabilities.
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Nest
A progressive Node.js framework for building efficient, scalable, and enterprise-grade server-side applications with TypeScript/JavaScript 🚀
If you follow a strict domain model, and propagate changes to other aggregates through events, you can adhere to the above criteria. You're probably writing Java, C#, or JS with Nest (which really, really wants to be Java).
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How does it compare to Tesseract? https://github.com/tesseract-ocr/tesseract
I use ocrmypdf (which uses Tesseract). Runs locally and is absolutely fantastic. https://ocrmypdf.readthedocs.io/en/latest/
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
Project mention: OpenTelemetry: The Foundation of Modern Cloud-Native Observability — Traces, Metrics, Logs, and the Future of Observability | dev.to | 2026-05-28Grafana Labs ecosystem Datadog New Relic Dynatrace Splunk Elastic Custom data lakes and analytics systems
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Strapi
🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.
Project mention: Three Ways to Convert JSON to TypeScript. Only One Is Deterministic. | dev.to | 2026-04-27CMS content. Headless CMS responses from Strapi, Sanity, or Contentful are deeply nested. Type them once; let the compiler catch template bugs.
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AppFlowy
Bring projects, wikis, and teams together with AI. AppFlowy is the AI collaborative workspace where you achieve more without losing control of your data. The leading open source Notion alternative.
Project mention: Tell HN: Notion Desktop is monitoring your audio and network | news.ycombinator.com | 2025-07-17 -
Project mention: Original NASA Apollo 11 guidance computer source code for the Lunar Module | news.ycombinator.com | 2026-05-30
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Project mention: 33-js-concepts VS javascript - a user suggested alternative | libhunt.com/r/33-js-concepts | 2026-01-15
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
HacktoberFest discussion
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New `llama.cpp` Updates, AI Agents for Any LLM, and Quantized Vector Index for Local Inference
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A note from our sponsor - SaaSHub
www.saashub.com | 14 Jun 2026
Index
What are some of the best open-source HacktoberFest projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | free-programming-books | 390,075 |
| 2 | TheAlgorithms | 221,910 |
| 3 | go-formatter | 175,286 |
| 4 | transformers | 161,558 |
| 5 | excalidraw | 125,112 |
| 6 | axios | 109,069 |
| 7 | Windows Terminal | 103,557 |
| 8 | Material UI | 98,400 |
| 9 | app-ideas | 94,925 |
| 10 | Design Patterns | 94,119 |
| 11 | Home Assistant | 87,648 |
| 12 | sherlock | 84,944 |
| 13 | Stirling-PDF | 80,668 |
| 14 | PayloadsAllTheThings | 78,311 |
| 15 | Nest | 75,780 |
| 16 | tesseract-ocr | 74,650 |
| 17 | Grafana | 74,334 |
| 18 | Strapi | 72,350 |
| 19 | AppFlowy | 72,227 |
| 20 | Apollo-11 | 68,066 |
| 21 | 33-js-concepts | 66,458 |
| 22 | Java | 65,829 |
| 23 | Docusaurus | 65,192 |
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