Create surfaces from curve networks: With T-Splines, you can easily make any organic shape, even with holes and non-rectangular boundaries, as a single surface from a network of input curves—without the need for additional fillets, blends, or trims. This single T-Splines surface is always gap-free regardless of complexity, smooth and curvature continuous where needed.
Loft surfaces from any input curves: When you loft a T-Spline surface, your input curves can each be optimal for the curvature they are describing—you don't need to worry about how their control point count will interface with the control points of the other curves in the loft. T-Splines will isolate the detail and generate a surface with control points just where you need them.
Create non-rectangular surfaces: Using simple T-Splines commands, it’s easy to generate non-rectangular surfaces if needed—something that’s not possible to do using NURBS.
Build models from T-Splines primitives:Start with a sphere, cube, cylinder or torus as the basis for your model.
Case studies & tutorials
Lay out the curves to define your entire model. Select the curves all at once, walk through the three-step wizard, and create a smooth model with no blends, trims, or fillets.
By using T-Splines for Rhino, Syse was able to model this mouse as a single smooth surface, directly from input curves, saving considerable time in the process. Read more...
Read an advanced tutorial for creating surfaces from curves. This tutorial was created by Nicolas Denhez from Dell. Read more...
Many more beginner and advanced tutorials are available here.
Introductory video
Molded plastic chair from input curves ( 5 minutes )
Products 
