Here is a sampling of programs/resources that promote progress in Math and a brief overview of each. 

Many Eyes
: Allows you to visualize data in various and stimulating ways. 

Screen-casting
: Animated screen captures combined with audio feed to produce student and/or teacher led demonstrations 
of major concepts. 
I-Flash: Virtual Flash Cards and so much more! 

Geometer’s Sketchpad
: Mathematics Visualization Software: 

Wolfram Alpha: Computational Knowledge Engine- MUST see it to understand it!  

Gaming: The internet is packed with math game sites. Here are a few of the thousands:
Survey Monkey: Use this to gather and calculate survey data. 

Poll Everywhere: Sick of telling the kids to put their phones away? Use them to answer quiz questions instead!