What libraries have you used to create interesting user interfaces?

Vue.js with Quasar and Vuetify components for rapid development on Material Design. React with Material UI and Ant Design for flexible customization. Svelte for lightweight, high-performance interfaces.

For animations: GreenSock (GSAP) for complex, frame-by-frame animations. Animate.css for simple, ready-made animations. React Spring for physically accurate animations in React.

For working with charts: Chart.js and D3.js.

For modal windows, sliders, and other UI elements: specialized libraries, for example, Swiper for sliders, Downshift for autocomplete.