Behavioural Calculus
- Offers a range of functionality, including a scientific calculator, function plotting in two and three dimensions, and problem solving. Site includes screen-shots and details of features. Commercial, but free demo version available to dowload.
- http://pages.zid.com/~orfeo/

GraphFunc
- GraphFunc is a program online that is used to plot the graph of mathematical functions in two or three coordinate systems. You need Java Runtime Environment to use this site.
- http://graph.seriesmathstudy.com

The Integrator
- An online integrator that automatically evaluates integrals.
- http://integrals.wolfram.com/

Calculus Made Easy for the Ti89/Titanium/Ti-92+/Voyage200
- Collection of subprograms and menus that will help the user solve calculus problems and recall useful theorems, definitions, and rules.
- http://www.islands.vi/~shawn/ti_89.htm