Valve is a tech company located in Bellevue, Washington, that was founded in 1996. Products commonly associated with Valve are the digital content delivery/management system called Steam and the game engine called the Source. The debut of Valve’s game Half-Life in 1998 was ranked as one of the best PC-based games of all time. Popular Valve titles include Left 4 Dead, Team Fortress 2, and Counter-Strike. In the news, Valve has become an open critic of the Windows 8 platform. In 2012, Valve was estimated to be worth $2.5 billion. Overall, Valve has an estimated 3,400 games on Steam, and Valve has over 75 million user accounts that are active.