Predrag Janicic,
GCLC --- A Tool for Constructive Euclidean Geometry and More than That
streaming video
Tim Hoffmann and Markus Schmies,
jReality, jtem, and oorange --- a way to do math with computers
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Christopher Creutzig,
MuPAD's graphics system
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Hans-Christian Hege,
Visualization of Dynamical Systems
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Martin von Gagern,
Hyperbolic Ornaments - Drawing in Non-Euclidean Crystallographic groups
streaming video