Key

Key is a Japanese visual novel studio under Visual Arts founded by Jun Maeda, Shinji Orito, and Itaru Hinoue. They are known for making dramatic and plot-oriented visual novels and they have also formed Key Sounds Label for their music tracks. Key has also produced an internet radio show called Key Radio.

Past Works:
Angel Beats! -1st beat- (Visual Novel) (2015)
Rewrite Harvest festa (Visual Novel) (2012)
Rewrite (Visual Novel) (2011)
Kud Wafter (Visual Novel) (2010)
Angel Beats! (Anime) (2009)
Little Busters! Ecstasy (Visual Novel) (2008)
Little Busters! (Visual Novel) (2007)
Tomoyo After (Visual Novel) (2005)
Planetarian ~the reverie of a little planet~ (Visual Novel) (2004)
Clannad (Visual Novel) (2004)
Air (Visual Novel) (2000)
Kanon (Visual Novel) (1999)

(Source: Wikipedia)