geoxml3.js and ZipFile.complete.js has been fetched from the googlecode project : http://code.google.com/p/geoxml3/
from the branch kmz (which seems to be the branch containing the most features)
http://code.google.com/p/geoxml3/source/browse/#svn%2Fbranches%2Fkmz

The latest version fetched when writing this was https://github.com/geocodezip/geoxml3/tree/a07796fa205d9d40a3c6f898a44324245935984f.