Calculators http://www.math.com/students/tools.html
Dr. Math http://mathforum.org/dr.math/
Cool Math http://www.coolmath.com
Miscellaneous Math Sites http://www.awesomelibrary.org/Classroom/Mathematics/Middle-High_School_Math/Middle-High_School_Math.html
Math Help http://www.studybuddy.com
SAT Prep http://www.collegeboard.com