SmartDraw is a charting & diagramming application, similar to Visio. I had used Visio for many years, but switched to SmartDraw because of the lower price. I liked it so much, I provided a free testimonial. SmartDraw has just launched a new Education package, which includes many aids that a teacher would find useful. It’s an easy program to learn, but the whole education package is still $(US)265.00, so I doubt if it would fit into most classroom budgets. Worth a look if you have the money.