The below are free for today only, according to the app description.
Fruit Ninja (iPhone): https://itunes.apple.com/en/app/fruit-ninja/id362949845?mt=8
Fruit Ninja HD: https://itunes.apple.com/en/app/fruit-ninja-hd/id370066032?mt=8
Fruit Ninja Puss in Boots (iPhone): https://itunes.apple.com/au/app/fruit-ninja-puss-in-boots/id469297662?mt=8
Fruit Ninja Puss in Boots HD: https://itunes.apple.com/us/app/fruit-ninja-puss-in-boots-hd/id467303097?mt=8
Age of Zombies Anniversary: https://itunes.apple.com/us/app/age-of-zombies-anniversary/id451365136?mt=8
Age of Zombies: https://itunes.apple.com/us/app/age-of-zombies/id395627741?mt=8
Monster Dash: https://itunes.apple.com/us/app/monster-dash/id370070561?mt=8