
Description: Underscore.js is a JavaScript library that provides utility functions for common programming tasks like mapping, filtering, and functional programming paradigms. It allows developers to leverage functional techniques which can help manage state and complexity in web applications.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Umbrella JS is an open-source JavaScript framework for building user interfaces and single-page applications. It is lightweight, modular, and designed for rapid web development.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API