[Leica] Stitching program?

[Peter Klein]

Last summer I spent several hours in the Kunsthistoriche Museum in 
Vienna, looking at and photographing their "Ancient Instruments" 
collection. They have examples of instruments from the middle ages to 
the middle of the 20th century. I was like a kid in a candy store.

The Rules were you could photograph anything you wanted, but no flash 
and no tripods. I can do that. I plan to put up a gallery of what I 
photographed for fellow musicians to see.  The pictures aren't perfect 
given the conditions, lighting and reflections off glass cases, but the 
chance to see these instruments is worth it.

Some longer instruments, such as my beloved bassoons, would not fit in a 
single picture without my backing off and losing too much detail, so I 
took them in two or three sections, using my knees as a camera elevator. 
(Ouch!)   Can anyone recommend a stitching program that would put them 
together again.  Easy is good.  Free is good, although not too expensive 
is also OK if it's worth the money.

Here are two sets of three pictures each of some bassoons and 
contrabassoons to show you what I am dealing with.  I don't care what 
happens to the backgrounds or the non-subject instruments at the sides 
of the pictures.

<http://gallery.leica-users.org/v/pklein/temp/P6150271.jpg.html>
<http://gallery.leica-users.org/v/pklein/temp/P6150270.jpg.html>
<http://gallery.leica-users.org/v/pklein/temp/P6150269.jpg.html>

<http://gallery.leica-users.org/v/pklein/temp/P6150257.jpg.html>
<http://gallery.leica-users.org/v/pklein/temp/P6150256.jpg.html>
<http://gallery.leica-users.org/v/pklein/temp/P6150255.jpg.html>

Thanks for any advice.
--Peter