It is possible to use our laboratory of curves in:
www.mat.uned.es/GeoCM/2PP/lab_curvas/_apps/matematica3d_20.app/matematic...
(please be patient, some times our server is very slow)
With this laboratory it possible to visualize the Frenet frame, osculatrix circle, evolute, osculatrix plane, ... and to compute curvature, torsion, arc length, ... of differential curves.
There are several curves previously defined and the user can introduce its favourite ones using parametrization or curvature and torsion (i.e. it is possible to experiment with the fundamental theorem of curves).

This year I start a new experiment: the use of design laboratories in Java for learning some concepts in mathematics.
I use the tool: Easy Java Simulations. It works very well.
Now I am in a JEM meeting, I will give more details in the following entry.