Information in the game database is updated periodically. Below, you'll find that information compiled as pertains to Firaxis Games. The company may be involved as a publisher, developer or both.
Civilization Revolution 
CivCity: Rome (PC) [July 26, 2006]
Civilization IV (PC) [October 25, 2005]
Civilization IV: Warlords (PC) [July 26, 2006]
Civilization V (PC) [September 21, 2010]
Sid Meier's Pirates! - Live the Life (PC) [November 22, 2004]
XCOM: Enemy Unknown (PC) [October 9, 2012]
Sid Meier's Pirates! - Live the Life [July 11, 2005]
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.