
Description: Alien Swarm is a free-to-play cooperative shooter video game developed by Valve Corporation. Players team up with up to 3 other players to fight off relentless swarms of aliens using a variety of weapons and equipment across a number of campaign missions.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Zandronum is a multiplayer-focused engine port that allows you to play classic Doom games online with others. It builds on the Doom source code to provide features like character classes, player levels, and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API