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.