Recoil lets you create a data-flow graph that flows from atoms (shared state) through selectors (pure functions) and down into your React components. Atoms are units of state that components can subscribe to. Selectors transform this state either synchronously or asynchronously.

Reach Router is a small, simple router for React that borrows from React Router, Ember, and Preact Router. Reach Router has a small footprint, supports only simple route patterns by design, and has strong (but experimental) accessibility features.

Blueprint is a React-based UI toolkit for the web. It is optimized for building complex, data-dense web interfaces for desktop applications which run in modern browsers and IE11. This is not a mobile-first UI toolkit.

Build forms in React, without the tears. Formik takes care of the repetitive and annoying stuff—keeping track of values/errors/visited fields, orchestrating validation, and handling submission—so you don't have to. This means you spend less time wiring up state and change handlers and more time focusing on your business logic.

JavaScript and TypeScript finite state machines and statecharts for the modern web.

The official, opinionated, batteries-included toolset for efficient Redux development