Mac Emulation Downloads » SmartFlip
www.osx-e.com/downloads/applications/smartflip.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
SmartFlip is a replacement for the Flip3D function in Windows Vista. It places the windows on a circle (it’s actually a ellipsis combined with a parabola)