Fabian Wenzel and currently hosted on the hugin sourceforge site.
The license for panoglview is the GNU General Public License (GPL).
You can download pre-compiled versions of panoglview as part of the hugin installer bundles for OS X and Windows. panoglview is available for linux distributions through the usual channels.
Panoglview is intended to view full 180x360 (equirectangular) panoramas projected onto a globe which can be spun around using the mouse.