Spline
spline.design
3D design in the browser, exported to the web
ToolsFreemiumReactWebGL
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The WebGL renderer everyone builds on
Preview Three.js inline
Loads the real site in a frame. Some sites block embedding — if it comes up blank, use Open instead.
Scenes, cameras, materials and post-processing. Verbose on its own, but every 3D-on-the-web abstraction eventually sits on top of it.