National Library of Virtual Manipulatives:  
Virtural manipulatives related to the NCTM.

 

eManipulatives:  
online manipulatives  http://www.eduplace.com/kids/mw//manip/mn_4.html

 

 

Bank of Manipulatives:
http://teachinglearnerswithmultipleneeds.blogspot.com/2012/11/virtual-manipulatives-for-math.html
 

 

Arrow Cards Demonstrator:
 http://www.ictgames.com/arrowCards_revised_v6.html

 

 

Decimal Demonstrator:  
http://www.ictgames.com/decimalDemonstrator/index.html

 

 

 

Online Tools:

 

Big Caluculator: 
http://www.amblesideprimary.com/ambleweb/mentalmaths/BigCalculator.html