
Description: GreenVBox is an open-source and free virtualization software that allows users to run multiple operating systems on a single machine. It is lightweight, easy to use, and focused on efficiency and environmental sustainability.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: QEMU is an open source machine emulator and virtualizer. It can emulate a complete computer system, including peripherals, and allow you to launch different operating systems without rebooting your physical machine.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API