No, although concentrating mostly on the Halo series, they also offer other games such as the Myth series.
Bungie also made:
ONI
Myth 1-3 (1= The Fallen Lords. 2=Soulblighter. 3=The Wolf Age)
Minotaur
Operation: Desert Storm
GNOP! (<- First Computer Game created by bungie!!)
Pathways into darkness
Marathon 1-3 (1= Marathon. 2=Marathon: Durandal. 3=Marathon Infinity)
All of those are old computer games made from 1992+.