BracketUI is a free, open source component library built natively for TailwindCSS v3. Drop it into any React or Next.js project with a single install. Includes Button, Navbar, MegaMenu, Card, Tab, and ThemeToggle — with a three-way theme system (light, dark, system) that syncs with device preferences out of the box for Next.js. Scaffold a new project instantly: npx @thirdbracket/create-bracketui-app my-app MIT licensed. Free forever.