In this directory, you can find:

1) a bash script to interpolate horizontally : interp 
This script relies on the SCRIP (Spherical Coordinate 
Remapping and Interpolation Package) for the computation 
of the interpolation weights and on a fortran executable
written by Virginie Guemas and added to the SCRIP package
to apply these weights : scrip_use
You can also extrapolate after interpolating with 
scrip_use_extrap

2) the fortran sources from SCRIP are also available in 
case you need to compute new interpolation weights. 

3) a python script to interpolate vertically : 
interp_vert.py

4) a python script to extrapolate vertically :
vertextrap.py

5) a python script to extrapolate horizontally a 
3d field : extrap.py

6) a python script to extrapolate horizontally a 
2d field : extrap2d.py

7) the fortran sources to rotate the U and V components 
on the ORCA irregular grid.

More information can be found here:
http://ic3.cat/wikicfu/index.php/Tools/Interpolation