Valve Software

Valve Software is a software company founded by Gabe Newell, most notably for creating Steam.

Games Created
 * Portal
 * Portal 2
 * Half-Life 1
 * Half-Life Opposing Force
 * Half-Life Source
 * Half-Life Alyx
 * Half-Life 2
 * Half-Life 2 episode 1
 * Half-Life 2 episode 2
 * Team Fortress: Classic
 * Team Fortress 2
 * Dota 2
 * Richochet