
Description: YO! is a messaging app that enables users to send the word 'Yo' to friends and receive 'Yo's back. It's designed to be a very simple way to connect with friends and get their attention.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Briar is a peer-to-peer encrypted messaging app designed for activists, journalists, and people at risk of persecution. It allows secure communication without relying on a central server, making it resistant to surveillance and censorship.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API