Apps Related to Extensible by Plugins/Extensions

Qt Creator is a powerful, cross-platform Integrated Development Environment (IDE) tailored for building applications with the Qt framework. It supports C++, QML, and JavaScript, offering a comprehensive suite of tools for designing UIs, writing code, debugging, and deploying software across various platforms.

Light Table is an innovative code editor designed to provide developers with instant feedback and a deeper connection to their code. It offers a clean and customizable interface, focusing on interactive development and visualizing data flow.

Mutt is a highly configurable, text-based email client for Unix-like systems. It offers powerful features for advanced users who prefer a lightweight and efficient email management experience directly from the command line.

Nightingale is a highly customizable cross-platform audio player with a focus on extensibility, featuring a beautiful interface, a wide array of supported formats, and tools like media library management, podcast playback, and integrated web browsing.

CodeLite is a free, open-source, and cross-platform Integrated Development Environment (IDE) designed specifically for C, C++, PHP, and JavaScript (Node.js) development. It provides a feature-rich environment to streamline the coding process for these languages.

Gajim is a free and open-source instant messaging client for the XMPP protocol. Built using the GTK+ toolkit, it offers a wide array of features for secure and flexible communication, including encrypted chat, group conversations, multi-protocol support via gateways, and extensive customization options.

Delphi is a powerful Object Pascal IDE and component library for developing native applications across multiple platforms, including Windows, macOS, iOS, and Android. It emphasizes rapid application development with a focus on high-performance, compiled executables.

Nylas Mail, an extensible open-source email client, offers a unified inbox, robust search, and calendar integration. It supports multiple accounts and provides features like email tracking and undo send, aiming to enhance productivity and email management for users.

Haroopad is a discontinued markdown-enabled document processor designed for creating web-friendly content. It offers a distraction-free writing environment with live preview and syntax highlighting, making it suitable for bloggers, writers, and developers.

Nemo is the default and highly customizable file manager for the Cinnamon desktop environment. It offers a robust set of features for managing files and folders efficiently, including multi-pane views, tabbed browsing, extensibility via plugins, and an integrated terminal for advanced users.

The Bat! is a secure and powerful email client for Windows designed for users who prioritize privacy, speed, and efficient email management, especially for handling large mail volumes.

ZOC is a professional terminal emulator designed for Windows and macOS. It offers a wide range of terminal emulation types and robust features for secure shell (SSH) and Telnet connections, scripting automation, and file transfers. It's a reliable tool for system administrators, network engineers, and developers.

WordWeb is a comprehensive offline English dictionary and thesaurus for Windows, macOS, iOS, and Android, offering definitions, synonyms, antonyms, and related words instantly from any application.

Keypirinha is a minimalist yet powerful portable launcher for Windows, designed for speed enthusiasts. It provides quick access to programs, files, and web searches through a streamlined interface, heavily relying on keyboard input for efficient navigation and workflow automation.

OpenELEC is a small, fast booting embedded operating system built specifically to turn your computer into a Kodi (XBMC) media center. It focuses on simplicity and minimal configuration for a plug-and-play home theatre experience.

Buildkite is a powerful CI/CD platform that allows teams to manage their build and deployment pipelines with exceptional flexibility. By leveraging your own infrastructure for build execution, it offers inherent scalability and control, while providing a centralized, user-friendly web interface for management and monitoring.

Multi Commander is a feature-rich, multi-tabbed file manager designed as a powerful alternative to standard Windows Explorer. It provides enhanced file management capabilities, extensive customization options, and supports a wide range of plugins and extensions.

Pinegrow Web Editor is a powerful desktop application for visually building websites and WordPress themes with live HTML and CSS editing. It combines the speed of a visual editor with the flexibility of a code editor, supporting popular frameworks like Bootstrap and Foundation.

Redaxscript is an exceptionally lightweight and high-performance Content Management System designed for simplicity and speed.

VMware vSphere Hypervisor, also known as ESXi, is a free, bare-metal hypervisor that allows users to virtualize their server hardware, consolidating applications and improving resource utilization. It provides a robust foundation for building virtualized IT environments.

Gwenview is a robust and user-friendly image viewer for desktop environments, primarily known for its integration with the KDE ecosystem. It offers a clean interface and essential tools for browsing, viewing, and performing basic edits on a wide range of image formats.

Globodox is a robust document management system designed for small to medium-sized businesses to streamline document handling, improve organization, and enhance security. It offers features like scanning, workflow automation, and secure sharing to help transform paper-based processes into an efficient digital workflow.

Weemss is a comprehensive, cloud-based event management software designed to streamline every aspect of organizing and running events, from registration and ticketing to attendee management and award ceremonies. It provides a self-service platform for creating and managing various event types efficiently.

PlantUML is an open-source tool that allows users to generate a wide variety of UML and other diagram types from a simple human-readable text description. It supports sequences, use case, class, activity, component, state, object, deployment, timing diagrams, and more, making it accessible and efficient for technical documentation and visualization.

Sleipnir is a versatile web browser designed for seamless integration between desktop and mobile devices. Offering a range of customization options, robust privacy features, and built-in tools like an RSS reader and social media integrations, Sleipnir aims to provide a tailored browsing experience.

Org-mode is a powerful and flexible mode for GNU Emacs, designed for note-taking, project planning, to-do list management, and authoring documents. It utilizes simple plain text files with intuitive markup.

Nomacs is a fast and lightweight free, open-source image viewer offering a wide array of features for diverse image formats, including RAW and PSD. It provides essential editing tools, batch processing capabilities, and extensibility via plugins, making it more than just a simple viewer.

Fedena is an open-source school management software built on Ruby on Rails, designed to streamline administrative, academic, and communication processes for educational institutions.

Rocket.Chat is a comprehensive free and open-source team communication platform, offering real-time chat, audio/video conferencing, screen sharing, and file sharing. Designed for flexibility, it can be self-hosted on-premises for maximum control and customization, making it ideal for organizations prioritizing data privacy and security.

Programmer's Notepad is a fast and lightweight text editor designed specifically for programmers and developers. It offers extensive syntax highlighting for numerous programming languages, a powerful search and replace engine with regular expression support, and a highly customizable environment. Ideal for those seeking a free, open-source, and portable code editing solution.