Cool, free interactive textbook teaches design in 3-D.
Uneven mini-games let kids grapple with mechanics concepts.
Create eye-catching presentations with images and few words.
Brainstorm and organize on the go with virtual corkboard.
Dynamic, highly visual resource makes exploring words fun.
Innovative tool for programming on the iPad.
Beautiful astronomy resource is rich with information.
Easier to use, more fun than similar apps, but not as fancy.
Popular, trusted resource covers mature topics responsibly.