React, Flux, GraphQL, Hack, HHVM...? All of this and more!
Angular from Google was originally the native alternative to React.js. For some reason Angular has not kept up in popularity with React. Whether this boils down to it's framework approach or just the confusion between Angular an AngularJS is irrelevant. Over the course of 2017 Vue.js took the second popular place in UI development.
Both Next and Nuxt are very opinionated. This is because they are full frameworks, with components selected by the vendor. This is more natural for Vue users that are accustomed to having a cohesive ecosystem with recommended routing and state management libraries. React developers are more inclined to spend time hand picking libraries and honing configurations instead of using a framework like Next.js.