Websites to Extensible by Plugins/Extensions

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.

Wibki is a personalized start page and bookmark manager that helps you organize, visualize, and access your favorite websites and information efficiently. It transforms your browser's new tab page into a customizable dashboard for quick access to frequently visited sites and relevant content.

Koding is a cloud-based development environment that automates the setup and management of isolated coding workspaces. It provides an online IDE, built-in tools, and team collaboration features to streamline development workflows.