Quake Live (previously known as Quake Zero) is a free FPS video game by id Software designed to run on x86-based computers running Microsoft Windows, Mac OS X or Linux that is downloaded and launched via a web browser plugin. It is a variant of its predecessor, Quake III Arena. The game first appeared in 2007, entered an invitation-based closed beta in 2008, and an open beta began on February 24, 2009