Bootstrap is a front-end toolkit designed to help developers and designers of all skill levels build web products faster and easier. It features a responsive grid system, support for multiple browsers and devices, dozens of pre-built components, jQuery plugins, and uses LESS for efficient CSS coding.
melonJS is an open-source HTML5 game engine for indie developers offering 2.5D rendering, GPU-accelerated tilemaps, 3D mesh support, and physics, all in ~250 KB of vanilla JavaScript with no dependencies. It features a Canvas2D-inspired API, automatic fallback across WebGPU, WebGL 2, and Canvas, and includes batteries-included tools like audio, particles, and UI components.