why-did-you-render by Welldone Software monkey patches React to notify you about potentially avoidable re-renders. (Works with React Native as well.)

Use any of the 1000+ fonts (and their variants) from fonts.google.com in your Expo app.

React component for the Intersection <Observer /> API

Dead simple Object schema validation

Build forms in React, without the tears 😭

Easily link to other apps with React Native.

🚩 FastImage, performant React Native image component.