A wikipedia article on entity extraction. A useful survey of actual use of APIs.
opencalais is from Reuters.
$2,000 / (100K queries * 30days) = .066 cents per query
One must prepay $24K for the year. The daily cap is 100K queries & 20/sec.
Tried the firefox addon. For the ag2.0 agenda, nba.yahoo.com, & IGN.com, the results are poor.
gate is from U of Sheffield. It is more focused on NLP or language engineering.
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