Company CILAT created these great apps:
Geographia, Shi Zi 1: Learn Chinese Characters (Simplified & Traditional Chinese) 识字基础（简繁体）, Archimedes' Roost: Math Exploratorium for Kindergarten, Shi Zi 2: Learn Chinese Characters (Simplified & Traditional Chinese) 识字基础（简繁体）, ShiZi 3: Learn Chinese Characters (Simplified & Traditional Chinese) 识字基础（简繁体）, Arborgraphia, and others..
