Yahoo! Correlator
Yahoo! Correlator (2008) was the first yahoo! sandbox demo developed in Yahoo! Labs Barcelona. It allowed smart searches over the English Wikipedia exploding shallow NLP tools to identify Named entities (places, dates, people). At that time this demo was pushing what search engine were able to do, see this blog. This demo is no longer available since Yahoo! Sandbox demos were closed around 2014.
Related papers: El paper de la lingüística en la cerca d’informació (In Catalan).