FrontEnd (UI) Technologies

Javascript resources

NodeJS Javascript Runtime
Npm Package manager
Yarn Package manager
Typescript Typed JavaScript

CSS

Bootstrap Build fast, responsive sites with Bootstrap (Official documentation)
Bootstrap Table Bootstrap table extension (Official documentation)
Bootswatch Free themes for Bootstrap
Bootsnipp Design elements, playground and code snippets for Bootstrap HTML/CSS/JS framework

Misc. resources

Shields io Quality metadata badges for open source projects
Simple Icons Free SVG icons for popular brands
Github Readme Stats Get dynamically generated GitHub stats on your readmes!

React (Facebook)

React and Spring Data REST Spring official documentation
Spring Boot and React Java Full Stack Application [GIT]
React Upload/Download Files with Spring Boot API [GIT]
React University (Youtube) React Advanced Programing

Angular (Google)

Vue (Alternative)

Other Frameworks

Express JS NodeJS MVC framework