Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
Java is a class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible.
Vaadin is an open-source framework for building user interfaces and single-page applications using Java and TypeScript.