Hi Stefano,
Took a quick look at the Vectric stuff (aspire) and it looks like they offer the toolpath option too. So it's not "type out text" like that. It's a toolpath called "v-caving"....

The other thing these CAM packages like Vectric Aspire or BobCad have is "embossing".

So in BobCad, they have "BobArt" and i can emboss geometry using arcs and lines and angles, which produces this too....

But the result of these will be poly's, not NURBS.