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Open Source Browser Extensions

A curated collection of the best open source add-ons that extend browser functionality for productivity or utility..

Screenity

Free, private screen recording for Chrome

  • Stars

    18,963

  • Last commit

    2 days 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:

Loom

Harper

Fast grammar checking that respects your privacy

  • Stars

    Stars growing over the last 30 days17,472

  • 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:

Grammarly

LanguageTool

AI-powered grammar checker for 30+ languages

  • Stars

    15,236

  • Last commit

    10 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:

Grammarly

Requestly

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

  • Stars

    6,758

  • Last commit

    2 days 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:

Postman

Zen

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

  • Stars

    4,357

  • Last commit

    3 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:

AdGuard

Linguist

Privacy-focused translation with offline capabilities

  • Stars

    1,084

  • Last commit

    2 months 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:

Google Translate

Cloudmark

Organize and access your bookmarks seamlessly in the cloud

  • Stars

    80

  • Last commit

    3 months 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:

Pocket
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