
Description: Limbo is an open-source emulator for running Windows software on Linux, macOS, and other platforms. It uses Wine and QEMU to provide compatibility with Windows applications.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Microsoft Hyper-V Server is a free, standalone product that provides a hypervisor-based virtualization platform for running virtual machines on x64 Windows servers. It has a small footprint and basic management tools.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API