Amazing Applets
Solid of Revolution by Daniel Mentrard
Poncelet's Porism for 2 circles (order 3,4,5,6,7,8)
Poncelet's Porism for an Ellipse and a Paraola (order 3)
Poncelet's Porism for 2 Ellipses (order 3)
Poncelet's Porism for 2 Ellipses (order 5)
Poncelet's Porism for 2 Ellipses (order 6)