What is a technology gadget or software or website that could make a difference in education?

I could use some really good answers.
I need more specifics. I do not care about past technologies, or “things that have changed the world”. I am looking for an answer that gives a solid, elaborate answer of a technology that might actually be researched and devoloped in a large educational system that may not be mainstream as of yet. Whiteboards, and computers are not a good answer. A solid Web 2.0 site with a good Alexa start may help.

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