amphetype - Advanced typing practice program
Tales Untold - Smart stories for smart kids (and smart parents, too).
TypingMaster - Learn touch-typing technique, and improve/increase typing accuracy and speed.
Hullabalu - Interactive stories for kids
Type Fu - Type Fu is an app that will teach you how to type fast. The right way. On Mac, Windows and Chrome OS.
Storiella - Storiella has been founded by two former teachers who are now parents.