KSEG

http://www.mit.edu/~ibaran/kseg.html

KSEG is an interactive editor for geometric constructions (things you 
can make with a compass and straightedge).  Its real power is the ability
to define and reuse constructions (which are effectively geometric 
functions) while maintaining a direct-manipulation interface that lets 
you change anything and instantly see how the whole construction 
responds.  Since constructions can be recursive, you might call this a 
visual geometric programming language.  Included example constructions
include Julia fractals, Bezier curves, conic sections, and various other 
crazy things. 

To get a feel for how it works, go through the Brief Walkthrough
<http://www.mit.edu/~ibaran/kseg_help_en.html#Walk>, then read 
the section on Constructions
<http://www.mit.edu/~ibaran/kseg_help_en.html#Constructions>, then 
open julia.seg from the examples and try dragging the point "C" around.
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