Apps with 'Extensible by Plugins/Extensions' feature

Open-source browser with Gecko engine, supporting HTML add-ons and providing privacy features like Enhanced Tracking Protection and third-party cookie blocking.

Cross-platform, free media player supports multimedia files, DVDs, streaming, offers hardware acceleration, 4K, lossless audio, and more.

Free and open-source office suite with advanced word processing, spreadsheets, presentations, vector graphics, math formula editor, and database tools.

Free open-source suite with advanced photo retouching, composition, batch processing, plugin extensibility, custom scripting, and wide file format compatibility.

Free open-source code editor and Notepad replacement supporting multiple languages, featuring high speed, low resource usage, privacy focus, and plugin extensibility.

Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc.

Obsidian is a note-taking app that lets you create a personal knowledge graph with ease. It is designed for non-linear thinking and allows you to easily link your notes together wiki-style.

The qBittorrent project aims to provide an open-source software alternative to µTorrent. Additionally, qBittorrent runs and provides the same features on all major platforms (FreeBSD, Linux, macOS, OS/2, Windows). qBittorrent is based on the Qt toolkit and libtorrent-rasterbar library.

Privacy-centric, open-source browser with unique UI features like vertical tabs, Split View, and Zen Glance, focusing on security and tranquility.

Open source vector graphics editor supporting SVG with features like custom brushes, pressure sensitivity, and layer management across multiple platforms.

Fast, secure browser with built-in ad block, privacy controls, and global tracking protections. Optimizes data, speed, and battery life.

Free open-source multi-track audio editor and recorder with 32-bit float processing. Supports many formats and plugins for Windows, macOS, Linux.

A free, open-source painting program for professional artists offering customizable UI, 9 brush engines, layer support, and color management.

Free open-source 3D software for modeling, texturing, rigging, animation, rendering, compositing, video editing, and simulation.

Comprehensive software providing screen recording and live streaming on Mac, Windows, and Linux with powerful encoding support and unlimited scenes.

Web browser built on an open-source platform featuring multiple account support, integrated password manager, dark mode, real-time translation, and seamless cross-device syncing.

Free e-book manager offering library management, multi-format conversion, syncing to devices, news download as e-books, built-in viewer, editor, and privacy.

On-premises file sync, universal access, integrated collaboration, real-time communication with privacy and data control focus.

Free, extensible code editor with Git integration, AI-driven IntelliCode, and 30,000+ extensions, supporting various languages like Python, Java.

Open source note-taking app with Markdown support, to-do integration, and synchronization with cloud services like Dropbox and OneDrive.

Desktop-focused Linux system offering custom menus, multimedia codecs, browser plugins, native DVD playback, and integrated software manager with user-friendly tools.

Open-source password manager storing passwords, notes, and attachments offline with AES-256 encryption, browser extensions, cross-platform support, and TOTP.

Intuitive multi-track video editor with robust hardware-accelerated support; offers chroma key, color grading, and extensive audio/video format compatibility.

Ubuntu is a community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need - a web browser, presentation, document and spreadsheet software, instant messaging and much more.

Highly customizable browser with built-in ad and tracker blockers, Chromium compatibility, advanced tab management, cross-device sync, and strong privacy features.