What are some alternatives?
When comparing Gem.js and Microsoft Web Framework, you can also consider the following products
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Vue.js - Reactive Components for Modern Web Interfaces
GenesisUI - Bootstrap Admin Templates on steroids! Collection of premium bootstrap admin templates.
Svelte - Cybernetically enhanced web apps
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.