Apps to Extensible by Plugins/Extensions

Evolution is a comprehensive personal information manager for the GNOME desktop environment, designed to manage emails, contacts, calendars, and tasks. It provides a unified interface for various communication and organizational needs.

VSCodium is a community-driven, freely licensed distribution of Microsoft's VS Code editor. It removes proprietary telemetry and tracking, providing a truly open-source alternative for developers who prioritize privacy and freedom.

Awes.io is an open-source web ecosystem built on modern technologies like Nuxt/Vue and Laravel. It provides a robust foundation for rapidly developing Minimum Viable Products (MVPs) and scaling them into comprehensive web applications, including admin panels, CMS, and CRM systems.

Playnite is a free and open-source video game library manager with a unified interface for all your games, regardless of their platform. It supports importing games from various digital stores and emulators, offering powerful organization, customization, and automation capabilities.

Songbird was a feature-rich, open-source media player and web browser aimed at music enthusiasts. It offered a unique blend of music discovery, management, and playback functionalities, with extensive customization options through add-ons. Key features included music library management, playlist creation, syncing capabilities for various devices, and integrated web browsing for exploring music-related content.

GIMP (GNU Image Manipulation Program) is a powerful, free, and open-source raster graphics editor used for image manipulation, retouching, composition, and authoring. It supports a vast array of file formats and provides sophisticated tools comparable to commercial alternatives, making it a versatile choice for photographers, designers, and artists.

Notepad++ is a widely-used free and open-source text and source code editor for Windows. Built on the Scintilla editing component, it offers a rich set of features for programmers, including syntax highlighting for multiple languages, code folding, macro recording, and a tabbed interface for managing multiple files efficiently. Its lightweight design ensures fast performance even with large files.

Mozilla Firefox is a powerful, open-source web browser developed by the not-for-profit Mozilla Foundation. Known for its strong focus on user privacy and customization, Firefox offers a fast and secure browsing experience across multiple platforms, supported by a vast ecosystem of extensions.

Budgie is a modern and dynamic desktop environment designed for users seeking a balance of elegance and performance. It emphasizes a clean interface and a highly customizable experience, built with modern technologies.

Pimcore is an open-source data and experience management platform that integrates Product Information Management (PIM), Digital Asset Management (DAM), Customer Data Platform (CDP), and Web Content Management (WCM). It enables businesses to centralize, manage, and deliver digital data across various channels, facilitating rich customer experiences and streamlined e-commerce operations.

LibreELEC is a minimalist, embedded operating system built specifically for running Kodi, the popular open-source media center software. It's designed to be lightweight, fast, and incredibly easy to install and manage, transforming any compatible device into a dedicated media hub.

Sphinx is a powerful and flexible documentation generator written in Python. It takes reStructuredText or Markdown source files and compiles them into various output formats, including HTML, PDF, and ePub. Sphinx is widely used for documenting Python projects but is versatile enough for documenting any type of project or knowledge base.

Tkabber is a free and open-source instant messaging client specifically designed for the XMPP protocol. Built with the Tk toolkit, it offers a lightweight yet extensible platform for text-based chat, group conversations, and various interactive functionalities supported by XMPP.

Aurelia is a modern, open-source JavaScript client framework designed for building robust and maintainable web, mobile, and desktop applications, emphasizing simplicity and Convention over Configuration.

Kloxo (Lxadmin) was a free and open-source web hosting control panel designed for managing servers and hosted services on Red Hat and CentOS Linux distributions. Although discontinued, it offered a comprehensive suite of tools for server administration, domain management, email services, and more, primarily targeting shared and dedicated hosting environments.

Eric is a powerful, feature-rich integrated development environment (IDE) primarily designed for Python and Ruby development. Written in Python, it offers extensive capabilities for code editing, debugging, project management, and more, making it suitable for developers of all levels.

Lychee is a powerful, self-hosted photo management system that allows you to upload, manage, and share your photos with ease. With a beautiful interface, built-in privacy options, and support for various features, Lychee gives you full control over your digital photo collection.

Xataface is an open-source PHP framework designed to streamline the development of web-based database applications, offering rapid application development capabilities with a focus on MySQL integration.

Form Tools is a powerful, open-source PHP/MySQL form data management script designed for developers and businesses. It seamlessly integrates with existing web forms to capture, organize, and manage submissions through a user-friendly interface, offering extensive customization and extensibility.

Gimp Painter is a discontinued fork of GIMP specifically enhanced with tools for digital painting and drawing. It aimed to provide artists with advanced brush capabilities and performance optimizations tailored for creative workflows on the GIMP platform.

LimeChat is a feature-rich and user-friendly Internet Relay Chat (IRC) client specifically designed for macOS. It provides a clean interface for connecting to multiple IRC networks and channels.

PhotoQt is a fast, simple, and elegant open-source image viewer built with C++/Qt. It offers a clean interface, essential image viewing features, and basic editing capabilities, making it a great choice for quickly browsing and managing your image collection across different operating systems.

Lumina Desktop Environment is a lightweight and highly customizable desktop environment focused on performance and user control. It's designed to be simple, efficient, and extensible through plugins, offering a seamless experience primarily on BSD operating systems but adaptable to others.

KnockoutJS is a JavaScript library that helps you create rich, responsive display and editor user interfaces with a clean underlying data model. It leverages the Model-View-ViewModel (MVVM) pattern and features declarative data-binding.

Disa is a unified messaging hub that consolidates conversations from various services like SMS, Facebook, and WhatsApp into a single interface, simplifying communication management.

Markdown Edit is a robust Markdown editor exclusively for Windows, crafted for serious writers and developers who prioritize efficiency and keyboard-centric workflows. It emphasizes a clean interface and powerful feature set, moving beyond simple text areas to offer a true editing experience tailored for Markdown.

Citrix XenServer is a powerful, open-source virtualization platform designed for managing virtualized server infrastructures. It provides robust features for creating, deploying, and managing virtual machines and containers, making it a popular choice for data centers and cloud environments. XenServer offers high availability, live migration capabilities, and integration with various storage and networking solutions.

Jota Text Editor is a lightweight and highly customizable text editor designed for handling large text files efficiently. It offers a robust set of features including syntax highlighting, word count, and extensibility through plugins, making it a versatile tool for various text-editing tasks.

Scratch is a powerful yet lightweight text editor designed for developers and anyone working with code or plain text. It offers automatic saving, syntax highlighting, and a range of features to boost productivity, all within a customizable and extensible interface.

CotEditor is a free and open-source text editor designed specifically for macOS. It offers a clean and intuitive interface, making it a lightweight yet powerful tool for plain text editing, coding, and more.