Wolfram Mathematica Online Integrator - http://integrals.wolfram.com/index.jsp Allows users to enter an integrand in order to return the indefinite integral.
SymPy - http://code.google.com/p/sympy/ A Python library for symbolic mathematics.
Calculus Applets at St. Louis University - http://www.slu.edu/classes/maymk/MathApplets-SLU.html Provides applets demonstrating concepts of both single and multivariable calculus.
Calculus Problem Solver - http://www.runiter.org/calculus.htm A calculus tutorial software that can solve differentiation problems and generate step-by-step solutions. Tests differentiation skills by generating dynamic quizzes.
GraphFunc - http://graph.seriesmathstudy.com/ A program online that is used to plot the graph of mathematical functions in two or three dimensions. [Java required]
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