Some online sites for calculus help:
Math Archives at Univ. of Tenn. has a master list
Some sites below (no endorsements by me)
OJK's
precalculus page
visual
mathematics
Calculus-help.com
Calc101.com
Places mentioned for Mathematica help:
Wolfram site is accessed starting here
academic sites:
Indiana
University
Calculus and Mathematica at Univ. of Illinois
Calculus and Mathematica at Ohio State
A help page at North Carolina
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Your suggestions for other links are welcomed -- email Prof. Sachs here: rsachs@gmu.edu