Hey Robin,
so I guess I'll answer here instead of on my userpage [1]
After a quick look I got the impression that krpano is
currently state
of the art but you may know another program.
krpano is not an option, it is non-free.
A alternative would be panosalado2, but last time I checked it had
numerous problems, such as
* lack of documentation
* the need to re-project images into a cube panorama format before the
multiresolution modus works (needed to get an improvement for large
images over the current viewer)
* lack of cylindrical projection support
* lack of cut-off spherical pano support
The last two points mean that approximately 99.9999% of the panos on
commons will NOT work with Panosalado.
Believe me I looked hard for an alternative, and all I got was hours of grief!
Daniel
[1]
http://commons.wikimedia.org/wiki/User_talk:Dschwen#Panoramic_viewer