Apps to Extensible by Plugins/Extensions

openCanvas is a robust raster graphics editor specifically designed for digital painting and drawing. It offers a blend of tools for illustrators, manga artists, and digital painters, focusing on a natural drawing experience with advanced brushes, layer management, and unique features like Event function (Instant Reply) for recording and replaying your artistic process.

Kiwi IRC is a modern, open-source web-based Internet Relay Chat (IRC) client designed for simplicity and ease of use. It allows users to connect to various IRC networks directly through their web browser without needing to install desktop software.

Kohana is an open-source HMVC framework for PHP 5, designed to be swift, secure, and small. Built by a team of volunteers, it emphasizes object-oriented programming, extensibility, and includes robust features for web development.

wxMEdit is a versatile cross-platform text and hex editor, serving as a powerful alternative to the discontinued MadEdit. Built on C++ and wxWidgets, it provides developers and advanced users with robust features for editing text files and binary data.

FluxBB is a lightweight, open-source bulletin board system designed for simplicity, speed, and low resource usage. It offers core forum functionalities with a focus on performance and ease of use, distinguishing itself from more feature-heavy alternatives.

CLion is a powerful, cross-platform Integrated Development Environment (IDE) meticulously crafted for C and C++ development. Offering intelligent code assistance, integrated debugging, and robust build system support, it streamlines the development workflow across various operating systems, making it a top choice for professional C/C++ developers.

Buildbot is an open-source framework for automating the build, test, and release process of software projects. It operates as a job scheduling system, orchestrating various tasks based on code changes and other triggers.

Serif PhotoPlus is a powerful image editing software for Windows, offering a comprehensive suite of tools for photo manipulation, retouching, and creative effects. It was known for its user-friendly interface and robust feature set, catering to both beginners and experienced photographers.

Babun is a Windows shell with a focus on developers, providing a Unix-like command-line environment powered by Cygwin. It offers a wealth of pre-configured tools and features for seamless development workflows on Windows.

bbPress is a highly focused, minimalist forum software designed for seamless integration with WordPress websites. Developed by the creators of WordPress, it prioritizes speed and simplicity.

Tuleap Open ALM is a comprehensive open-source platform designed for agile project management and software development teams. It integrates various tools like Git, Kanban, Scrum, and issue tracking into a single, unified environment.

Diagram Designer is a free, lightweight vector graphics editor for creating various diagrams, including flowcharts, UML diagrams, illustrations, and slideshows.

PlayClaw is a highly optimized game recording and streaming software designed for gamers. It allows users to capture their gameplay in high quality with minimal performance impact, offering a range of features including in-game overlays, live streaming capabilities, and comprehensive hardware monitoring.

RealWorld Paint is a versatile discontinued graphics editor for Windows, supporting both raster and vector graphics. It offers robust photo retouching tools, layer support, and the ability to create and edit animations like GIFs and APNGs. Its portable nature and clean interface make it a solid option for various image manipulation tasks.

UiPath Studio Community is a powerful, free automation tool for individuals and small teams to design and execute robotic process automation workflows. It's ideal for automating repetitive tasks in desktop and web applications, making daily work more efficient and less prone to human error.

Smartsheet is a dynamic work management platform empowering teams to plan, track, and execute projects efficiently. It combines powerful features like project management, task management, collaboration tools, and automated workflows in a user-friendly, web-based interface.

PyScripter is a free and open-source integrated development environment (IDE) designed specifically for Python on Windows. It is built using Object Pascal and provides a comprehensive set of tools for efficient Python development, including debugging, code completion, syntax highlighting, and more.

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.

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.

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.

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.

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.

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.