Mathc: 
Calculus,
Algebra linear,
 In these packages, you can verify the result into GnuPlot. 
Calculus  Packages :
  
Chapter 03 : The Derivative. 
c03a.zip : The tangent
c03b.zip : The normal
c03c.zip : Newton's method
c03e.zip : Mean Value
Chapter 05 : Appplications of the definite integral. 
c05a.zip : Area
c05b.zip : Solids of revolution."Disk"     
c05c.zip  : Solids of revolution. "Cylindrical Shells"
Algebra linear :
mtrxgo.zip : Geometric applications 
vectac.zip : Vector2d (Reflection, Orthogonal projection) 
vectad.zip : Vector2d (vertical horizontal shift) 
vectae.zip : Vector3d (Reflection, Orthogonal projection)