Tracker: Desktop-Neutral First Class Object Database
"Tracker is a powerful desktop-neutral first class object database, tag/metadata database, search tool and indexer. Tracker is also extremely fast and super efficient with your systems memory when compared with some other competing frameworks. It consists of a common object database that allows entities to have an almost infinte number of properties, metadata, a comprehensive database of keywords/tags and links to other entities. It has the ability to index, store, harvest metadata. retrieve and search all types of files and other first class objects."