I attended an AATE meeting a couple weeks ago, and am just now getting around to trying out a few of the sites I heard mentioned. Here are some potential winners.
Piktochart Creates good-looking inforgraphics
Sparkfun Electronics store for makers
Museum Box Neat presentation software, which allows kids to set up a museum-like portal in a virtual box
Thinking Dice Great conversation starter or essay-builder for the classroom
Gapminder Great data visualization software; you’ve probably seen it in TED talks
YouTube Time Machine See videos from events through time, good for nostalgia!