
Description: Tweet Tray is a free Twitter desktop client app for Windows. It allows you to conveniently access Twitter in an overlay window while working on other tasks, with features like tweet composing, notifications, search, media previews, and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: PenPal World is a pen pal matching service that connects people from around the world to exchange letters and emails. It allows users to find pen pals based on shared interests, language learning goals, age groups, and regions of the world.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API