Acid Bomb from Alchemist and Drunken Haze from the Brewmaster are two spells that 'throw' at an arc. Through there are many other spells that 'throw' but at a straight angle and at a targeted unit like Firebolt, Icebolt, Stormbolt, Death coil, Shadow Strike to name the most familiar ones.
Though I'm sure you can just manually alter the throwing arc of a throwing missile art by altering the Art - Missile Arc. Though I'll admit I haven't experimented with it much as of yet.