React - A JavaScript library for building user interfaces
wxWidgets - wxWidgets: Cross-Platform GUI Library
Vue.js - Reactive Components for Modern Web Interfaces
Electron - Build cross platform desktop apps with web technologies
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.