DiskAt is disk/media catalogue app supporting multiple categories per item, good search and features which allow to use it as Movie/DVD/etc database. Written with PHP/Python/SQLite.
The Open Archive Cataloguer (zOAC) project applies the OAI-PMH protocol for automatic metadata harvesting and aggregation of bibliographic records and has been developed over the web application server Zope. Based on Pentila's ZOpenArchives Zope Product.