calais: http://blog.viewchange.org/2010/05/entity-extraction-content-api-evaluation/ http://blog.viewchange.org/2010/05/entity-extraction-content... kea, libe

calais: http://blog.viewchange.org/2010/05/entity-extraction-content-api-evaluation/ http://blog.viewchange.org/2010/05/entity-extraction-content... kea, libextract http://www.nzdl.org/Kea/ http://www.nzdl.org/Kea/ http://www.gnu.org/software/libextractor/ http://www.gnu.org/software/libextractor/