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VisualMaths is a 2D curve drawing program (3D and dynamic curves not yet available). User defines objects (functions,variables,arrays) and assign each object to a curve and an axis. VisualMaths also provides some graphic solvers : minima, maxima.
GlyphEdit is a vector oriented drawing application written entirely in Java.
It feautures an AA graphics renderer of own design and a set of custum GUI elements (buttons, panels) that resemble the look of Apple Mac OS X.
ThreeSpace is a 3D drawing program, or modeller if you will, primarily intended for visualizing and playing with mathematical functions. It allows you to superimpose these or otherwise alter objects in 3D using them.