Animated Knots 3D -- Free Until Noon Tomorrow (9/16)! Nynix Development is offering Animated Knots 3D as a free app in a promotional, limited-time offer. This 3D Knot app gives a wealth of information on each knot: Usage, Structure, Strength and History. Interactive features include Draw (pause/play), Flip, Zoom and Rotate for each 3D Knot. Want to see how a Bowline looks from the back? Just spin the knot around 180 degrees and have a look! While the 3D features are cool, the best feature is its FREE! This is a limited time offer that expires at 12PM tomorrow.