This is a Blender plugin which imports DEC Object File Format (.off) files. This feature was built-in for blender 2.49 but apparently has been removed for version 2.54 beta. I have implement the input parsing according to this format specification.
However, note that I add a face as a triangle fan. Hence, you may take care that your faces are all convex. Blender 2.49 also had this restriction. If you know how to easily add a non-convex n-gon to blender within the Python blender API then please write me a mail. Maybe I add some triangulation code for faces in the future. However, the cleaner solution would be to add the actual n-gon.
Installation. As the Blender API keeps up changing frequently, I moved the code to a git repository at git.sthu.org. You can clone the repository or obtain the file io_import_off.py in the current version. This file needs to be placed into Blender’s addon directory. On my system this is ‘/usr/share/blender/scripts/addons/’.