Stella4D
Here's a press release for geometry enthusiasts from Robert Webb:
(looks like a great update for this interesting looking software; another enticement to get an Intel-based Mac, I suppose Happy
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I just released version 4.0 of Stella, plus a new product called Stella4D. It includes everything from Great Stella, but also includes
support for 4D polytopes! Watch a tesseract (4D cube) undergoing 4D rotation. Watch 3D cross-sections of 4D polytopes animating as the slicing hyperplane cuts deeper and deeper. All 1849 known uniform 4D polychora are included, plus more! Happy

I attach a photo of a paper model I made of a 4D polytope using nets created and printed from Stella4D (the cantellated tesseract).

Home page:
http://web.aanet.com.au/robertw/Stella.html

Get the demo of Stella4D here:
http://web.aanet.com.au/robertw/Downloads.html

See a bunch of screenshots, including animated ones, here:
http://web.aanet.com.au/robertw/ScreenShots.html
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