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three.js (mrdoob/three.js) is an open-source JavaScript library for real-time 3D graphics in the browser, released under the MIT license. It renders through built-in WebGL and WebGPU renderers, with SVG and CSS3D renderers shipped as separate addons. It's the library behind the scene-graph API shown in its own README example: a camera, a geometry, a material, and a mesh composed into a scene and redrawn each frame through an animation loop.

Apache ECharts is an open-source charting and data visualization library maintained at apache/echarts, written in pure JavaScript and rendered through zrender, a canvas library built for the project. The GitHub repo is available under the Apache-2.0 license, and the README documents an npm package, a CDN build, and extension packages including ECharts GL for 3D and WebGL.

Sharp is a Node-API module that wraps libvips, making it the practical choice when you need to process images in a Node.js environment without the overhead of a full ImageMagick installation. The README claims 4x-5x faster resizing compared to ImageMagick and GraphicsMagick, and it handles the tricky parts correctly: ICC colour profiles, alpha transparency, and auto-orientation all work without surprises. Beyond simple resizing, it covers rotation, extraction, compositing, and gamma correction — useful for building image pipelines that would otherwise require multiple tools stitched together. One concrete upside for local development: most macOS, Windows, and Linux machines need no extra system libraries to run it.