
Description: StencilJS is an open-source toolkit for building reusable, standalone Web Components using TypeScript. It focuses on creating smaller, faster components that work natively in modern browsers without needing large frameworks or runtimes. Stencil components work with popular frameworks like React, Angular, and Vue.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Polymer is an open-source JavaScript library for building web applications using Web Components. It allows developers to create custom, reusable HTML elements with encapsulated functionality and styles.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API