On display at the Monochromatic Museum of Archaic Electronics (otherwise known as my bedroom closet) is a relic from the past that never got used as it should have. The Apple eMate, a device based on the Newton platform but which came in a clamshell case with an integrated keyboard and a carrying handle, was designed to be sold to schools but never took off before Steve Jobs returned to Apple and shut down the Newton division entirely. The design for the case influenced the following generations of Macintosh computers: it presaged the later PowerBook, iBook, and iMac designs.
This is not in any way an exhaustive review of apps for iOS. It is instead a list of apps I have personally found useful. I may not have tried alternates so while I welcome alternate suggestions in the comments, please accept my apologies in advance if I’ve made a choice in ignorance of an app superior to the one I’m recommending. As I don’t have unlimited funds, I’ve made some of my choices based on user or editorial reviews without trying every possibility.