Watermelon UI blocksfor shadcn/ui.

Watermelon UI is an open-source React catalog from WatermelonCorp, built for Tailwind CSS and shadcn/ui. It's strongest on dashboards, with full app layouts for meetings, invoicing, task and issue tracking, HR, ERP, mail, job tracking, medical, library and portfolio use cases, so you can start from a realistic product screen rather than a single widget. It also has animated components, landing page blocks such as heroes and bento grids, and a landing page template that shows the blocks working together.

Code can be copied from the site or installed with the shadcn CLI. For tools and agents, Watermelon publishes a public read-only catalog API with an OpenAPI spec, llms.txt and a hosted MCP server, none of which need an API key. The project is free to use, supported by sponsors, and its platform and registry source are public on GitHub.