The BnlViewer is a rich, interactive viewer for METS/ALTO files. METS files are standardized xml files in use at the major libraries in the world to represent digitized material. The BnlViewer is developed and maintained by the national library of Luxembourg and can be seen in action at:
http://www.eluxemburgensia.lu
The [screenshots] page shows several examples of what it looks like. These screenshots are from:
http://www.eluxemburgensia.lu
via email: eluxemburgensia [at] bnl [dot] etat [dot] lu
Bibliothèque nationale de Luxembourg
37, boulevard F.D. Roosevelt
L-2450 Luxembourg