OpenFeint
OpenFeint was a social platform for mobile games for devices running on Android or iOS. It was developed by Aurora Feint, a company named after a video game by the same developers. Wikipedia
Initial release date: February 17, 2009
Founder: Jason Citron
Stable release: 2.7.5 (1.7 Android) / Nov 5, 2010 (Jan 27, 2011 Android)