• www.ies.co.jp/math/java/calc/limsec/limsec.html What is a secant line?
• http://math.furman.edu/~dcs/java/tangent.html Movable secant line for y=x^2 at x=1
• http://www.calvin.edu/~rpruim/courses/m161/F01/java/SecantTangent.shtml Moveable secant line approximating a tangent line.
• www.ies.co.jp/math/products/calc/applets/heihen/heihen.html Shows average rate of change both graphically and with a table.

• http://archives.math.utk.edu/visual.calculus/1/bisection.3/index.html The bisection method to find roots of third degree polynomials

• The Integrator evaluates indefinite integrals. It's from Wolfram Research, Inc. and uses Mathematica. Try it! You'll wish you could take it with you to an exam.
• wolframalpha.com

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