Spline is a free, real-time collaborative 3D design tool to create interactive experiences within the browser. Easy 3d design animations, models, textures, and more.
Three.js is a cross-browser JavaScript library and application programming interface used to create and display animated 3D computer graphics in a web browser using WebGL.
These days if a website takes more than a few seconds to load, people tend to close the page and move on. CSS loaders are a great way to keep your users engaged while your website loads.