Information in the game database is updated periodically. Below, you'll find that information compiled as pertains to Gearbox Software. The company may be involved as a publisher, developer or both.
PC & Miscellaneous
Duke Nukem Forever (MAC) [August 16, 2011]
Duke Nukem Forever (PC) [June 14, 2011]
Half-Life: Blue Shift (PC) [June 12, 2001]
Half-Life: Opposing Force (PC) 
Homeworld: Deserts of Kharak (PC) [January 20, 2016]
Borderlands: The Handsome Collection [March 24, 2015]
Brothers in Arms: D-Day [December 5, 2006]
Aliens: Colonial Marines [February 12, 2013]
Borderlands [October 20, 2009]
Borderlands 2 [September 18, 2012]
Borderlands DoubleGame Add-On Pack [April 13, 2010]
Brothers in Arms: Hell's Highway 
Duke Nukem Forever [June 14, 2011]
There are numerous companies in the industry, and their names change like the weather. The information above is not particular about the finer details. Acquisitions are common, so companies with no recent listings may still be developing games under a new name. For example, DMA Design currently has a Rockstar name. Do you know of a title that is not listed above but should be? Be sure and let a staff member know. You can contact staff if you click here.