HTML5 - 5th major revision of the core language of the World Wide Web
Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
Blazor - An experimental web UI framework using C#/Razor and HTML, running in the browser via WebAssembly
Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications
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.
Django - The Web framework for perfectionists with deadlines