
Description: StumbleUpon is a web discovery platform that recommends web content to its users. It uses collaborative filtering to analyze user ratings and preferences to suggest interesting websites and articles that match the user's interests.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Pinterest is a visual discovery engine for finding ideas like recipes, home and style inspiration, and more. It allows users to save images and videos to their own boards and share ideas with others.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API