  Catroid is a free and open source visual programming language, programming
environment, image manipulation program, and website. Catroid allows casual and
first-time users starting from age eight to develop their own animations and
games solely using their Android phones or tablets. Catroid also allows to
wirelessly control external hardware such as Lego Mindstorms robots via
Bluetooth, Bluetooth Arduino boards, as well as Parrot's popular and
inexpensive AR.Drone quadcopters via WiFi.
