Stencil is a compiler that generates Web Components (more specifically, Custom Elements). Stencil combines the best concepts of the most popular frameworks into a simple build-time tool.

Stencil takes features such as

Virtual DOM
Async rendering (inspired by React Fiber)
Reactive data-binding
TypeScript
JSX

and then generates standards-based Web Components with these features baked in.

A collection of accessible, modern front-end components.

Frend components are modest and dependency-free. They are built with web standards as a priority and aim to avoid assumptions about tooling or environment. Care has been taken to make sure each component is compliant, keyboard navigable and properly interpreted by assistive technologies.

Vue.js is a library for building interactive web interfaces. It provides data-reactive components with a simple and flexible API. Core features include:

Dead simple, unobtrusive reactivity using plain JavaScript objects.
Component-oriented development style with tooling support
Lean and extensible core
Flexible transition effect system
Fast without the need for complex optimization

Isolate your React UI Component development from the main app. Now you can develop and design React UI components without running your app. You just load your UI components into the React Storybook and start developing them.
This functionality allows you to develop UI components rapidly without worrying about the app. It will improve your team’s collaboration and feedback loop.

Web Components usher in a new era of web development based on encapsulated and interoperable custom elements that extend HTML itself. Built atop these new standards, Polymer makes it easier and faster to create anything from a button to a complete application across desktop, mobile, and beyond.