Create React App is a new officially supported way to create single-page React applications. It offers a modern build setup with no configuration.
Preact is an attempt to recreate the core value proposition of React using as little code as possible, with first-class support for ES2015. Currently the library is around 3kb (minified & gzipped).
React-Animations is a collection of animations that can be used with any inline style library that supports using objects to define keyframe animations, such as Radium or Aphrodite. React-animations implements all animations from animate.css.
Awesome React Components is a huge catalog of React components and libraries. You can also add your react component / library to this catalog.
react-dates is an accessible, easily internationalizable, mobile-friendly datepicker library for the web.
Recharts is a composable charting library built on React components.
ReactJS.NET makes it easier to use Facebook's React and JSX from C# and other .NET languages, focusing specifically on ASP.NET MVC. It assumes you already have some basic knowledge about React.
React Sortable is a set of higher-order components to turn any list into an animated, touch-friendly, sortable list
Checkbox.css is a tiny set of CSS3 animations for your checkbox input.
Material Kit is a Free Bootstrap UI Kit with a fresh, new design inspired by Google's Material Design. Material concepts in an easy to use and beautiful set of components.
Angular Filter is a bunch of useful filters for AngularJS with no external dependencies.
Material Design components for Angular 2 apps.
Victory is an opinionated, but fully overridable, ecosystem of composable React components for building interactive data visualizations.