DERIVATIVE WEBSITES
Average rate of change:
http://www.ies.co.jp/math/java/calc/heihen/heihen.html
Secant line and tangent line:
http://www.ies.co.jp/math/java/calc/limsec/limsec.html
Animation of secants approaching a tangent:
http://www.ima.umn.edu/~arnold/calculus/secants/secants1/secants-g.html
http://www.ima.umn.edu/~arnold/calculus/secants/secants2/secants-g.html
Zooming in on a tangent line:
http://www.ima.umn.edu/~arnold/calculus/tangent/tangent-g.html
Graph of tangent line and derivative:
http://mathplotter.lawrenceville.org/mathplotter/mathPage/derivative.htm
Graph of a derivative:
http://www.ies.co.jp/math/products/calc/applets/doukan/doukan.html
http://www.geogebra.org/en/examples/function_slope/function_slope1.html
http://www.ltcconline.net/greenl/java/Other/DerivativeGraph/classes/DerivativeGraph.html
3 derivative puzzles:
http://www.univie.ac.at/future.media/moe/galerie/diff1/diff1.html#ableitung
Big derivative puzzle:
http://www.univie.ac.at/future.media/moe/tests/diff1/ablerkennen.html