Apps to Extensible by Plugins/Extensions

Shareaza is a veteran peer-to-peer file sharing client for Windows, distinguished by its support for multiple network protocols including Gnutella2 (G2), eDonkey, and BitTorrent. It offers a robust feature set for searching, downloading, and managing files across various networks, providing a versatile platform for digital content acquisition.

Polymer is a JavaScript library developed by Google for building web applications using reusable custom HTML elements. It simplifies the creation of complex user interfaces by leveraging modern web standards.

Crowdin is a cloud-based localization management platform designed for businesses of all sizes. It streamlines the translation process for websites, software, games, and marketing materials, enabling teams to collaborate efficiently and deliver multilingual content quickly and accurately.

Novius OS is a flexible, open-source content management system (CMS) designed for creating and managing websites, e-commerce stores, intranets, and more. Built on the robust FuelPHP framework, it offers a modular architecture and an intuitive interface for effective digital content management.

CodeLobster PHP Edition is a free, portable IDE designed for rapid development of PHP, HTML, CSS, and JavaScript web applications. It offers robust features like smart autocompletion, an integrated debugger, and a powerful set of tools for efficient coding and debugging.

Ex Falso is a robust, free, and open-source cross-platform audio tag editor designed for meticulous music library management. It provides powerful tools for editing metadata across various audio formats, ensuring your collection is organized, searchable, and consistent.

tinyMediaManager is a free, open-source tool designed for effortless management of your vast movie and TV show collections. It automates the process of gathering metadata, artwork, and other details from online sources, ensuring your media library is organized and easily navigable for seamless integration with media center software like Kodi.

Icedove is a robust and adaptable open-source email client forked from Mozilla Thunderbird, offering comprehensive email management, RSS feed aggregation, integrated chat, and extensive customization options through extensions.

YouTrack is a powerful and flexible bug tracker, issue tracking system, and project management software designed for development teams. It provides a centralized hub for managing projects, tracking tasks, reporting bugs, and collaborating efficiently, offering a highly customizable workflow and extensive integrations.

Futuramo Visual Tickets is a revolutionary project communication and issue tracking tool that transforms bug tracking, request management, and feedback gathering into a visual and collaborative process. It streamlines team workflows and enhances communication by enabling users to report issues directly on screenshots.

Moovida, formerly Elisa, was an open-source, cross-platform media center designed to offer a visually appealing and intuitive interface for managing and playing multimedia content. Providing support for various media formats and streaming capabilities, it aimed to be a central hub for digital entertainment.

OneSwarm was a file-sharing client focused on privacy and anonymity, designed to operate within a darknet or a friend-to-friend network.

X-Chat 2 for Windows is an unofficial, open-source build of the popular X-Chat IRC client, specifically tailored for the Windows operating system. It provides a robust platform for connecting to various IRC networks and engaging in real-time communication with other users.

KMail is a powerful and flexible email client tightly integrated with the Kontact personal information manager suite. Part of the KDE ecosystem, it offers robust features for managing your email, including strong encryption options, support for multiple protocols like IMAP, POP3, and Exchange, and seamless integration with other Kontact components like the calendar and address book.

Caret is a robust and feature-rich text and code editor designed for the Chrome platform, offering advanced editing capabilities, syntax highlighting, and offline functionality for developers and writers.

ExpressionEngine is a versatile and powerful content management platform designed for building dynamic websites, blogs, and web applications with a focus on flexibility and developer control.

RAD Studio is a comprehensive integrated development environment (IDE) for building native applications across multiple platforms including Windows, macOS, iOS, Android, and Linux. It supports development with both Delphi (Object Pascal) and C++.

Simple Machines Forum (SMF) is a powerful and free open-source forum software designed to provide a robust platform for online communities. It offers a comprehensive set of features for building and managing dynamic message boards.

MyBB (MyBulletinBoard) is a free, open-source forum platform written in PHP and utilizing MySQL. It provides a robust and extensible solution for building online communities, offering features like integrated spam protection, user management, and a plugin system for customization.

Futuramo Time Tracker is a robust time tracking application designed to enhance productivity and manage work time effectively. It offers a suite of features for individuals and teams to monitor activities, analyze performance, and streamline time management processes.

Speed Dial is a versatile browser extension designed to replace your default new tab page with a highly customizable visual dashboard, offering quick access to frequently visited sites, bookmarks, and browsing history for enhanced navigation and productivity.

ArchiCAD is a powerful BIM software suite designed for architects, engineers, and construction professionals. It facilitates comprehensive building information modeling, design, and documentation workflows for projects of all scales on both Windows and macOS platforms.

RapidWeaver is a powerful, all-in-one web design platform exclusively for macOS, empowering users to create stunning, responsive websites without requiring extensive coding knowledge. It offers a visual drag-and-drop interface combined with robust features for building modern, dynamic web presences, making web development accessible to both beginners and experienced designers.

Psi+ is a robust, cross-platform XMPP/Jabber client tailored for users who prioritize control, privacy, and extensibility. As a development branch of the classic Psi client, it offers advanced features for secure and customizable instant messaging.

ABBYY Lingvo Dictionaries for desktop and mobile devices provide powerful tools for language translation, vocabulary acquisition, and language mastering. Offering comprehensive dictionaries, contextual translations, and versatile search capabilities, Lingvo supports a multitude of languages for individuals and professionals.

rxvt-unicode, often abbreviated as urxvt, is a highly customizable and lightweight terminal emulator known for its performance and extensive feature set provided through plugins. It's a fork of the original rxvt and is a popular choice for users seeking a fast and highly configurable command-line interface.

Visual Paradigm is a comprehensive modeling and design tool for software development, enterprise architecture, and business process analysis. It supports a wide range of diagramming notations including UML, BPMN, ERD, and more, facilitating code generation, reverse engineering, and team collaboration.

Adobe Bridge is a powerful digital asset management application that helps you organize, browse, locate, and preview your creative assets quickly and efficiently. It is a complete solution for managing photos, videos, and other media files, offering robust features for metadata management, batch processing, and seamless integration with other Adobe Creative Cloud applications.

Mylio helps you organize, protect, and access your photos and videos across all your devices without relying solely on cloud storage. It leverages a unique approach to keep your entire library synchronized and accessible, offering powerful organization, editing, and sharing tools.

SynWrite is a comprehensive and free source code editor for Windows, serving as an excellent Notepad replacement with robust features for various programming and web development tasks. It's designed for performance and extendibility, making it suitable for both novice and experienced developers.