Khan Academy
Khan Academy: Gibbs Free Energy and Spontaneity
Explanation of Gibbs Free Energy and Spontaneity. Includes formulas and examples.
Chem4kids
Chem4 Kids: Equilibrium Basics
This Chem4Kids.com site explains what equilibrium is in easy-to-understand language. Content includes a great example, as well as exploring different things which effect the position of equilibrium.