I think GeoGebra is the most useful software I use in the classroom.

My Take

I think GeoGebra has changed the way I teach and the way students learn for the better. It is a quick way to give students a visual of what we used to spend time drawing by hand. You can use GeoGebratube applets on iPads or tablets so students can be interacting with the material while you are teaching. It also gives students the opportunity to produce quality work that they can be proud of. I think students find GeoGebra very easy to use. They tools are self explanatory. The possibilities for using GeoGebra in the math classroom are endless.