OS X's Spotlight is a great tool for finding that file you lost or launching apps, but it can do a lot more than just find the occasional file. Here are some of the coolest Spotlight tips, features, and shortcuts to make your Mac a time-saving, file-searching powerhouse.
DBpedia Spotlight is a tool for annotating mentions of DBpedia resources in text, providing a solution for linking unstructured information sources to the Linked Open Data cloud through DBpedia. DBpedia Spotlight performs named entity extraction, including entity detection and Name Resolution (a.k.a. disambiguation). It can also be used for building your solution for Named Entity Recognition, amongst other information extraction tasks.
Apple's metadata filesystem - stores file metadata in seperate database, import for common and customized file metadata, sophisticated api and command line query
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