[cad-linux] simple (and cheap) CAD pkg for task

I discovered this list in my search for an answer to the question below.  If 
this question is not appropriate for this list, I apologize and just let me 
know.
I want to produce a 3D object saved in Parasolid x_t format from 5 
cross-sections.  Each section saved in a text file as a list of 
x,y,z-coordinates (ending point same as beginning) defining a closed curve 
around the cross section.  I want the solid body to smoothly go through the 
closed splined curve that passes through the points of each section.  I want to 
be able to read in the coordinates from the files since there are 75 points per 
section and I don't want to hand-type each point into the software.

Can someone recommend the simplest or cheapest software to do this?  Is a free 
trial version of such software available?

Thanks,

Arif

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