Company Erica Sadun created these great apps:
To Do, Moo, PasteCatcher, Draw, Draw for iPad, Doc Tool, Sadun's Whiteboard, Sadun's Collage, Color Sampler, Rapid'art, redacted math, Art Helper, monsterizer pro, Enigma Cryptoquote Puzzle Challenge, folderol, Color App, Fidget, Tock, Quote, Triviata: Simple Fun Trivia, and others..