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I was wondering if anybody knew of any good Perl modules and/or Java classes for sentiment analysis. I have read about LingPipe, but the program would eventually need to be used for commercial use so something open-source would be better. I also looked into GATE, but their documentation on sentiment analysis is sparse at best.
Have a look at Rate_Sentiment in the WebService::GoogleHack module at CPAN. There’s more information about the project at SourceForge.