Software for Teaching Geometry
GeoGebra is an amazing package, which replaces the use of a compass and ruler in teaching basics of geometry.
I have become a huge fan of a free multi platform application called GeoGebra 5, which offers an awesome way of learning and experimenting with different concepts in geometry.
The reason why I am writing about it is because I completely misunderstood the whole point of the application and how it works, for a long time. This made me not appreciate its genius.