Chemistry Helper http://www.chem4kids.com/
Biology Helper http://www.biology4kids.com
Earth Science Helper http://kids.earth.nasa.gov/
Make a GREAT Graph Online http://nces.ed.gov/nceskids/Graphing/
English/Metric Conversions http://www.onlineconversion.com/
English/Metric Conversions http://www.sciencemadesimple.com/conversions.html
English/Metric Conversions http://www.digitaldutch.com/unitconverter/