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Open Source Browsers & Extensions

A curated collection of the best open source web browsers and browser extensions enhancing productivity or utility.

See also:Web BrowsersBrowser Extensions
Favicon of Ladybird

Ladybird

An independent browser engine built from scratch, not a fork

  • Stars

    65,743

  • Last commit

    7 hours ago

  • License

    BSD-2-Clause
Open source web browser with its own engine, built from scratch without Blink, WebKit, or Gecko. Non-profit backed, no search deals, no user monetization.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Zen Browser

Zen Browser

Privacy-focused browser with powerful customization

  • Stars

    43,980

  • Last commit

    8 hours ago

  • License

    MPL-2.0
A Firefox-based browser offering enhanced privacy, split views, and extensive customization options for a personalized browsing experience.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Helium

Helium

Privacy-first browser with ad-blocking and no bloat

  • Stars

    19,609

  • Last commit

    7 hours ago

  • License

    GPL-3.0
Chromium-based desktop browser with default ad and tracker blocking, no analytics, native !bangs, split view, and full MV2 extension support.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Brave

Brave

Fast, private browser that puts you first

  • Stars

    23,375

  • Last commit

    9 hours ago

  • License

    MPL-2.0
A secure web browser that blocks ads and trackers, protects privacy, and loads pages faster while saving data and battery life.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Screenity

Screenity

Free, private screen recording for Chrome

  • Stars

    18,488

  • Last commit

    1 day ago

  • License

    GPL-3.0
Capture, annotate, and edit screen recordings with no limits or sign-up required. Completely private and open source.

Open Source Alternative to:

Favicon of Screen Studio
Screen Studio
Favicon of Harper

Harper

Fast grammar checking that respects your privacy

  • Stars

    14,597

  • Last commit

    9 hours ago

  • License

    Apache-2.0
Open source grammar checker that analyzes your writing quickly while keeping your data completely private and secure on your device.

Open Source Alternative to:

Favicon of Grammarly
Grammarly
Favicon of LanguageTool

LanguageTool

AI-powered grammar checker for 30+ languages

  • Stars

    14,836

  • Last commit

    9 hours ago

  • License

    LGPL-2.1
Check grammar, punctuation, and spelling errors instantly with AI-powered technology. Supports 30+ languages with browser extensions and desktop apps.

Open Source Alternative to:

Favicon of Grammarly
Grammarly
Favicon of Requestly

Requestly

Intercept, modify, and debug HTTP(S) requests effortlessly

  • Stars

    6,750

  • Last commit

    14 hours ago

  • License

    AGPL-3.0
A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Open Source Alternative to:

Favicon of Postman
Postman
Favicon of Deta Surf

Deta Surf

Browser and notebook combined with local-first AI

  • Stars

    3,529

  • Last commit

    2 days ago

  • License

    Apache-2.0
A browser that doubles as a personal notebook, letting you research, summarize, and take notes on web pages, PDFs, and videos without switching apps.

Open Source Alternative to:

Favicon of NotebookLM
NotebookLM
Favicon of Zen

Zen

System-wide ad-blocking and privacy protection, no extensions needed

  • Stars

    4,134

  • Last commit

    6 days ago

  • License

    MIT
Free, open-source desktop app that blocks ads, trackers, and surveillance scripts across all browsers and apps on Windows, macOS, and Linux.

Open Source Alternative to:

Favicon of AdGuard
AdGuard
Favicon of Flow

Flow

Fast, secure browsing with powerful organization features

  • Stars

    1,066

  • Last commit

    3 months ago

  • License

    GPL-3.0
A modern browser combining minimalist design with smart features like profiles, spaces, and command palette. Full Chrome extension support and privacy-focused browsing.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Linguist

Linguist

Privacy-focused translation with offline capabilities

  • Stars

    1,051

  • Last commit

    12 days ago

  • License

    BSD-3-Clause
Full-featured browser extension for translating web pages, text, and subtitles with offline mode, personal dictionary, and custom translator support.

Open Source Alternative to:

Favicon of Google Translate
Google Translate
Favicon of Browser Operator

Browser Operator

AI
Open-source AI browser for intelligent web automation

  • Stars

    500

  • Last commit

    5 months ago

  • License

    BSD-3-Clause
Privacy-focused AI browser with intelligent agents for research, analysis, and workflow automation. Features unified memory, compliance guardrails, and seamless integrations.

Open Source Alternative to:

Favicon of Comet Browser
Comet Browser
Favicon of Midori Browser

Midori Browser

Fast, secure, and privacy-focused web browsing

  • Stars

    371

  • Last commit

    2 days ago

  • License

    MPL-2.0
Midori Browser is a lightweight, fast, and secure browser that protects users' privacy, available for Windows, Linux, and Android.

Open Source Alternative to:

Favicon of Firefox
Firefox
Favicon of Cloudmark

Cloudmark

Organize and access your bookmarks seamlessly in the cloud

  • Stars

    75

  • Last commit

    10 days ago

  • License

    AGPL-3.0
Cloud-based bookmark manager that lets you save, categorize, and access your web favorites from any device with smart organization features

Open Source Alternative to:

Favicon of Pocket
Pocket
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