Calculus Resources

General
Desmos(dynamic online graphing tool with a free app for Android and iOS!)
Khan Academy (practice exercises and videos: Differential Calculus & Integral Calculus)
Kuta Software (worksheets with answer keys)

Trigonometry (see Pre-Calc/Trig Resources)

Derivatives
Derivate (view and graph lines tangent to a curve)

Integrals
Integreat! (visualize and estimate integrals)