React JS

beUI is a free, open-source library of animated React components built with Motion and Tailwind CSS, installed via the shadcn CLI.

21st is a community catalog of 12,000+ React components, templates, shadcn themes, shaders, and gradients, each with an AI prompt for agents.

Spectrum UI is an open-source React and shadcn/ui component library with 250+ animated blocks, installable via CLI or an MCP server for AI editors.

Opensource UI offers 207 free React and Next.js components across 30 categories with live previews, MIT licensed and copied into your code.