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NVD3 is an open-source JavaScript visualization library built on top of D3.js. It aims to simplify the process of creating common chart types with D3 by providing reusable chart components. NVD3 offers a range of chart types including line, bar, scatter, and pie charts, all with built-in interactivity and responsiveness. While it abstracts away some of D3's complexity, it still allows access to the underlying D3 objects for advanced customization. NVD3 is particularly useful for developers who want to leverage D3's power but need a quicker way to create standard chart types.

Anime.js (pronounced /ˈæn.ə.meɪ/) is a lightweight yet powerful JavaScript animation library. It offers a simple and intuitive API for creating complex animations with ease. Anime.js can animate a wide variety of targets including CSS properties, SVG attributes, DOM elements, and JavaScript objects. Its lightweight nature doesn't compromise on features, offering timeline support, keyframes, and easing functions. The library is particularly popular for creating smooth, performant web animations, from simple UI interactions to elaborate motion graphics.

Raphael is a small, yet powerful JavaScript library for working with vector graphics on the web. It simplifies the creation and manipulation of Scalable Vector Graphics (SVG) using a consistent API that works across different browsers. Raphael abstracts the complexities of different SVG implementations and even provides VML support for older versions of Internet Explorer. This library is particularly useful for creating interactive diagrams, custom charts, or any scenario requiring programmatic manipulation of vector graphics. Its simplicity and cross-browser compatibility make it a valuable tool for developers working on projects that require sophisticated graphics rendering.

PixiJS is a powerful, open-source 2D rendering engine for the web. It utilizes WebGL for hardware-accelerated graphics rendering, with canvas fallback for older browsers. PixiJS is designed for creating high-performance animations, games, and interactive visualizations. It offers a simple yet comprehensive API for working with sprites, textures, and other 2D graphics elements. PixiJS is particularly noted for its speed, capable of rendering thousands of sprites at 60 frames per second. While primarily used for game development, it's also valuable for any web application requiring complex, high-performance 2D graphics.

Three.js is a cross-browser JavaScript library and API used for creating and displaying animated 3D computer graphics in web browsers. It utilizes WebGL for hardware-accelerated rendering, but can fall back on other rendering modes for older browsers. Three.js simplifies the complexity of 3D graphics programming, providing high-level abstractions for scenes, cameras, lights, and materials. It's widely used for creating 3D visualizations, games, product configurators, and immersive web experiences. Three.js supports various features including realistic lighting, shadows, textures, and even VR content creation.