Easy Funktion is an easy to use functionplotter that supports complex numbers as well as real numbers. Additional features are equation solving, approximation functions and a built in pocket calculator.
JFunctionViewer is a simple and fast OpenSource functionplotter. Since it is written in Java it is Platform independend and can even be run from inside a Browser.
Easy-to-learn interactive 2d plot program. Can overlay images, xy-data, and mathematical functions. Function parameters can be tuned with sliders; functions can also be automatically fitted to data. Written in Python, cross-platform, but currently broken
MathGenius is a graphical tool intended to simplify your work in mathematics. By now it includes a graphical functionplotter, a mechanism (still in development) to derive functions, and an equation solver. An extension mechanism will be developed.
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