Office of Engineering Diversity:
Below is a list of helpful websites that was compiled by Nicholas Pinn, Mechanical Engineering Student. They are a great resource for many engineering topics!
http://www.engineersedge.com/ - Great for definitions
All types of math (Algebra - Calculushttp://patrickjmt.com
http://www.math.psu.edu/tseng/class/fa2010.html - Entire notes index for Differential Equation
http://www.math.ncsu.edu/ma114/tools/row_ops.html - This tool will aid you in row reduction
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html - According to Nicholas, probably the best science site on the internet
http://www.cramster.com/ - Provides answers to most text books