
Description: Pattern Lab is an open-source web design tool that helps developers build modular, atomic, and reusable UI components using a pattern library methodology. It generates a static front-end style guide to document and organize these components.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Storybook JS is an open source tool for developing UI components in isolation. It allows you to visualize different component states, develop them interactively, and test them automatically.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API