History of Valve (School Work By kei990 Aug 24, 1996 Valve was Found by Gabe Period: Aug 24, 1996 to Jul 9, 2013 Valve Timespan May 1, 1998 Valve acquires TF Software PTY Ltd, maker of Team Fortress mod for quake Nov 8, 1998 Half life was released Apr 7, 1999 Team Fortress Classic was released Oct 31, 1999 Half life: Opposing force was released. developed by Gearbox Software Apr 12, 2000 Valve teamed up with the counter strike development team Nov 8, 2000 Counter strike 1.0 was released Jun 21, 2001 Half life: Blue Shift was released for PC only May 2, 2003 Half life 2 was announced in E3 Sep 12, 2003 Steam was released Mar 21, 2004 Counter Strike: Condition Zero was released Aug 11, 2004 Counter Strike:Source was released Nov 16, 2004 Half life 2 was finally released Jun 1, 2006 Half Life: Episode One was released Oct 9, 2007 Team Fortress 2 was released Oct 9, 2007 Portal was released Oct 17, 2008 Left 4 Dead was released Nov 17, 2009 Left 4 Dead 2 was released Apr 19, 2011 Portal 2 was released Jul 9, 2013 Dota 2 was released
