Gimp equivalent of Spherize

[tictak]

I have some photos which were taken with a fisheye lens, and I
want to "de-fisheye" them.  In Photoshop, there is a filter called
Spherize which does this for me.  Is there a similar tool in
GIMP which I can use for this purpose?

-- 
 Takuya Kobayashi
 University of Texas at Austin