Expo - The fastest way to build an iOS and Android app 📱
HTML5 - 5th major revision of the core language of the World Wide Web
Syncfusion - The world's best UI component suite for building powerful web, desktop, and mobile apps
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
Create React App - Create React apps with no build configuration
Angular.io - Angular is a JavaScript web framework for creating single-page web applications. The code is free to use and available as open source. It is further maintained and heavily used by Google and by lots of other developers around the world.