Websites to Extensible by Plugins/Extensions

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

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.

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

MOOVIA is a comprehensive project and team management platform designed to foster a secure and enjoyable social environment for collaboration, task management, document sharing, and internal communication.

Kanboard is a free and open-source Kanban project management software that streamlines task and project workflows. It offers a minimalist and visual approach to managing tasks, making it ideal for teams seeking simplicity and efficiency in their collaboration efforts.

AngularJS is a powerful open-source JavaScript framework developed by Google that enables developers to build dynamic single-page applications (SPAs). It simplifies front-end development by extending HTML with its directives and facilitating two-way data binding, promoting a Model-View-Controller (MVC) or Model-View-ViewModel (MVVM) architectural pattern.

Discourse is a modern, open-source discussion platform designed for building thriving online communities. It combines elements of traditional forums, mailing lists, and chat to foster civil and engaging conversations.

Wekan is a free and open-source Kanban board application designed for collaborative task management. Based on the principles of Kanban, it offers a visual way to organize work, track progress, and improve workflow efficiency for individuals and teams.

Tiki Wiki CMS Groupware is a free and open-source, all-in-one web-based application for collaboration and management. It combines a powerful wiki engine with comprehensive features for content management, project tracking, workflow, and office functions, making it a versatile solution for diverse organizational needs.

concrete5 is a powerful open-source Content Management System (CMS) known for its ease of use, featuring in-context editing and a flexible architecture. It enables users to build and manage websites and web applications with minimal technical expertise.

cPanel is a leading web hosting control panel designed for Linux servers. It simplifies server management and website hosting through an intuitive graphical interface, offering comprehensive tools for file management, email, databases, domains, and security.

ImpressPages is an open-source PHP framework and content management system (CMS) designed for building websites quickly and efficiently. It features a user-friendly drag-and-drop interface, a modular architecture, and includes functionalities for blogging, e-commerce, and more. Its framework core provides flexibility for developers.

Cloud9 IDE is a powerful online integrated development environment that provides a fully featured workspace accessible directly from your web browser. It supports a wide range of programming languages and frameworks, offering built-in debugging, terminal access, and collaborative features.

Pivotal Tracker is a powerful agile project management tool designed for software development teams. It simplifies the process of planning, tracking, and collaborating on projects, offering a clear visual workflow and focus on iterative delivery.

muCommander is a versatile, open-source file manager designed for productivity across various operating systems. It offers a dual-pane interface for efficient file operations, built-in support for network protocols like FTP and SSH, and extensive customization options, making it a powerful tool for both casual users and power users who need advanced file management capabilities.

Ajenti is an open-source, web-based server administration panel designed to simplify complex server management tasks. It provides a clean and intuitive interface for configuring services, managing files, controlling hardware, and monitoring server status, making it accessible for both experienced administrators and newcomers.

Trac is a mature open-source, web-based project management and bug tracking system. It integrates closely with version control systems and provides a wiki for documentation, making it a comprehensive tool for software development teams.

ISPmanager is a comprehensive Linux server and web hosting control panel designed for seamless management of dedicated servers and VPS. It simplifies complex tasks like website management, email organization, and server configuration through an intuitive graphical interface.

Jira, developed by Atlassian, is a leading issue and project tracking software primarily used by software development teams. It offers flexible workflows, powerful reporting, and seamless integration with other development tools, making it ideal for agile methodologies like Scrum and Kanban.

Google Sheets is a free, web-based spreadsheet application that allows users to create, edit, and collaborate on spreadsheets online. It's a powerful tool for data analysis, organization, and visualization, integrated within the Google Drive suite for seamless cloud storage and synchronization.

Sweet Home 3D is a comprehensive interior design application that helps users draw house plans, arrange furniture, and visualize their home design in 3D. It caters to individuals and professionals alike, offering a user-friendly interface with powerful features.

Webmin is a powerful, web-based system administration tool designed for Unix-like systems and Windows. It simplifies common administration tasks through a user-friendly interface, making it accessible for users of various technical levels. It is highly modular and extensible, supporting a wide array of system configurations and services.

TeamClerk is a comprehensive project and task management software designed for teams of all sizes. It facilitates seamless collaboration, task organization, and project tracking through intuitive features like Kanban boards, Gantt charts, and real-time updates. Manage your projects efficiently and enhance team productivity with TeamClerk.

Jitsi is a free and open-source suite of secure, flexible communication tools. It offers multi-platform support for voice (VoIP), video conferencing, and instant messaging, emphasizing privacy and ease of use with no account required to start a meeting.

MyFav.es is a personalized online start page and bookmark manager designed to consolidate your favorite links, web services, and productivity tools into a single, easily accessible dashboard.

WorkMate was a free and flexible web-based project management and team collaboration tool. It aimed to streamline task management, facilitate real-time collaboration, and provide a central hub for development teams with features like Kanban boards, document sharing, and integrations.

Redmine is a robust and flexible open-source project management web application designed to help teams manage projects, track issues, and collaborate effectively. It offers a wide range of features, including multi-project support, Gantt charts, time tracking, and extensive customization options through plugins and themes.

SketchUp is a powerful 3D modeling software widely used for architectural design, interior design, mechanical engineering, and more. It offers an intuitive interface and a vast library of pre-made models, making it accessible for both beginners and professionals.

Grav is a fast, flexible, and open-source flat-file CMS (Content Management System) that simplifies website creation and management. Requiring no database, it leverages the power of Markdown and Twig templating for efficient content delivery and extensive customization.

Microsoft Visual Studio is a comprehensive Integrated Development Environment (IDE) designed for building a wide range of applications across various platforms. It provides a rich set of tools for coding, debugging, testing, and deploying software.