ReactJS is a JavaScript-based front-end library creates dynamic applications, improves website UX/UI, and is well suited to mobile, single-page, and server-side applications.
AngularJS is mostly used for developing SPAs, but its flexibility allows developers to combine it with technologies such as Ionic, Cordova, or NativeScripy to build near-native mobile applications.
As a popular Javascript framework, Vue.js is used for creating lightweight and adaptable interactive UI elements and SPAs, and the MVVM model architecture pattern makes Vue.js easy to use.
Flutter lets you build flexible, native-like apps with a single codebase, and its ability to create native features and expressive elements on iOS and Android is one of its biggest benefits.
A powerful front-end framework such as Bootstrap provides HTML, CSS, and JavaScript templates to create typography, navigation, buttons, forms, and other critical UI elements of responsive websites.