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Top 23 Browser Open-Source Projects
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Project mention: Scarab Diagnostic Suite Field Test #012: Next.js Source Map Provenance Boundary | dev.to | 2026-06-06
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It sounds like all public contribution will simply be impossible. That said, they will continue to develop out in the open on GitHub and you can clone the repo and build whenever you want. You can continue to contribute in other ways.
https://ladybird.org/#contribute
I hate this change and agree with your PR comment. This change makes me sad as well.
My hope is that public contributions can resume in the future. Part of their justification for this step is that they are trying to stabalize the project to produce a stable public alpha. Fair enough. And many Open Source projects have begun to voice concerns over the burden that the massive increase in contributions is causing, often from AI. Linus Torvalds has certainly been flagging this. The Open Source world in general is going to have to navigate this and come to a solution that works without the entire Open Source ecosystem becoming read only.
Once Ladybird ships a "stable" browser out to the world, I am hoping they can adopt whatever the "best practice" for Open Source has become to be able to accept public participation again.
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Project mention: I built a GUI-powered Userscript manager for faster userscript creation! | dev.to | 2026-04-03
So I switched to Monaco editor, the same editor that powers VSCode. The extension instantly became a few MB heavier, but it was definitely worth it. Monaco editor was extremely powerful, with all the standard editor features such as renaming variables, syntax highlighting, and more just out of the box. I'm so glad I didn't have to implement any of that myself, yet it's available for everyone to use.
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Project mention: WebMCP Is the Quiet Google I/O Announcement That Could Make Web Apps Agent-Ready | dev.to | 2026-05-24
That sounds small until you compare it with the tool that exists today: Chrome DevTools MCP, Google's official MCP server that lets coding agents control and inspect Chrome through DevTools.
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Servo
Servo aims to empower developers with a lightweight, high-performance alternative for embedding web technologies in applications.
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slate
A completely customizable framework for building rich text editors. (Currently in beta.) (by ianstormtaylor)
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Project mention: Ask HN: Streaming a Bittorent Video from a Webpage? | news.ycombinator.com | 2025-11-29
WebTorrent works on the browser but I'm not sure if this is what you're asking for
https://webtorrent.io/
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Avalonia
Develop Desktop, Embedded, Mobile and WebAssembly apps with C# and XAML. The future of .NET UI
> I like WASM and I want to like WASM but the rate of maturity within the ecosystem is incredibly abysmal.
The C# toolchain for WebAssembly is pretty good. You can do a lot with Avalonia and Uno:
https://avaloniaui.net/
https://platform.uno/
Here's a C# clone of Visual Basic compiled to WebAssembly:
https://bandysc.github.io/AvaloniaVisualBasic6/
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ok good answer. next q: why not team up with https://github.com/lightpanda-io/browser and zig and make this both the small headless browser + a human one
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Project mention: A web page that shows you everything the browser told it without asking | news.ycombinator.com | 2026-05-08
Don't know about easy but their JS lib doing this is quite good:
https://github.com/fingerprintjs/fingerprintjs
Honestly surprised to see it licensed as MIT now too. It was something less permissive before. They aren't doing anything too crazy, more like being the first ones to be open about it.
I couldn't imagine what else companies like Google or Meta or TikTok can extract out of it that no one else can't.
Those advertisers benefit from monopolistic markets with zero regulation while owning the platforms they sell advertising on that requires their explicit malware in order to use, what is unique about their finger printing versus what fingerprintjs provides?
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Mocha - feature-rich JavaScript test framework running on Node.js and in the browser
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stagehand
The AI Browser Automation library by Browserbase. Write web automation scripts in plian english with primitives like act('click this button'), extract('get the price for xyz product'), and observe('find the submit button').
Project mention: Browser Tools for AI Agents Part 1: Playwright, Puppeteer, and Why Your Agent Picked Playwright | dev.to | 2026-04-26Right. So Stagehand (21.8k stars) is Browserbase's TypeScript SDK and it does something properly clever. It wraps Playwright with three AI primitives: act() (do something on the page), extract() (pull structured data out), and agent() (let the LLM figure out a multi-step flow). On paper that sounds like yet another Playwright wrapper. It isn't.
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Project mention: Chrome removes claim of On-device Al not sending data to Google Servers | news.ycombinator.com | 2026-05-07
This one: http://brave.com/
I don't use their browser but I like their search engine!
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Project mention: Launch HN: BrowserBook (YC F24) – IDE for deterministic browser automation | news.ycombinator.com | 2025-12-11
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Since 2019, I SingleFile (https://github.com/gildas-lormeau/SingleFile) potentially ephemeral pages into a folder and pick stuff out when I feel like it, pruning entries that have lost relevance or appeal. Browsers' Print to PDF feature would work too. The "system" is exactly as reliable as its operator. No reminders included, but I don't want my computer beeping at me (and maybe you don't want really want that either).
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We used to run terminal in browser using https://github.com/yudai/gotty and the entire dev team remapped their Ctrl+w to Ctrl+`. We did frontend and backend development with this setup almost for 1.5 years. Muscles memory and till this date, always have the fear if my actual terminal will get closed if I use Ctlr+w :P
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Project mention: Carbonyl – A Chromium-based browser built to run in a terminal | news.ycombinator.com | 2026-04-02
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Project mention: Tell HN: Helium is the best browser I ever used | news.ycombinator.com | 2026-06-07
Helium (https://helium.computer/) is Chromium-based, with all the Google odiousness removed, emphasizing minimalism, privacy, zero telemetry, built-in uBlock Origin, and no sync or AI features.
I am just a regular user that was looking for a Firefox alternative for a long time. I do not know why Helium does not get more attention. It's so fast all the time even with several hundred tabs, it never crashed, it is strongly privacy and safety protecting, I do not have one complaint about it.
Here are some ways the others fall short:
- Firefox and all its derivatives are frequently incredibly sluggish, even on the same machine at the same time other browsers based on Chromium and Webkit are fast. I really wanted to like them, but I just gave up finally. I can't even use Mullvad browser now.
- Safari's interface and UX seems somewhat clunky to me. I tried Orion; it shows a lot of promise as my secondary browser, but, even after updating it today, it has significant UI regressions. And this is for software that's past version 1.0.0
- Brave browser was pretty good, but I was disillusioned by their not taking user protection as seriously, and some of their "scandals"
- Of course, the least said about IE, Edge, Chrome, etc, the better
And I've tried a large number of browsers over the years: IE, Edge, Firefox, Opera, Safari, Konqueror, Chrome, Chromium, Firefox, Orion, Zen, Brave, Mullvad, DuckDuckGo, Vivaldi etc, etc.
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transformers.js
State-of-the-art Machine Learning for the web. Run 🤗 Transformers directly in your browser, with no need for a server!
Project mention: I Built a Text-to-Image Search Engine That Runs Entirely in the Browser | dev.to | 2026-05-23The thing that used to require a Python server with a GPU now runs in a tab. The library doing this magic is Transformers.js — Hugging Face's port of their Python transformers library to ONNX Runtime in JavaScript.
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).
Browser discussion
Browser related posts
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Tell HN: Helium is the best browser I ever used
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Nordstjernen Web Browser 1.0.0 released
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Tus: Open protocol for resumable uploads built on HTTP
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Changing How We Develop Ladybird
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Nordstjernen Web Browser
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Servo 0.2 Release
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Nordstjernen Web Browser version 0.8 released
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Jun 2026
Index
What are some of the best open-source Browser projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Next.js | 139,866 |
| 2 | ladybird | 63,712 |
| 3 | astro | 59,871 |
| 4 | Monaco Editor | 46,139 |
| 5 | chrome-devtools-mcp | 42,973 |
| 6 | Servo | 36,984 |
| 7 | serenity | 33,323 |
| 8 | slate | 31,684 |
| 9 | webtorrent | 30,976 |
| 10 | Avalonia | 30,928 |
| 11 | browser | 30,793 |
| 12 | fingerprintjs | 27,256 |
| 13 | mocha | 22,881 |
| 14 | stagehand | 22,980 |
| 15 | brave-browser | 22,757 |
| 16 | skyvern | 21,832 |
| 17 | SingleFile | 21,419 |
| 18 | Nightmare | 19,844 |
| 19 | gotty | 19,455 |
| 20 | carbonyl | 17,339 |
| 21 | helium | 16,889 |
| 22 | javascript-obfuscator | 16,091 |
| 23 | transformers.js | 16,071 |
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