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I am looking for something similar to IBM Watson but open source.

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  • $\begingroup$ A lot of Watson capability is based upon open source technologies mentioned in the various answers. It's the annotators that IBM has created, as well as some enhancements and research in developing the neural networks. $\endgroup$ – ReeceMed Dec 12 '17 at 10:38
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I am not aware of any open-source products that can readily replace IBM Watson, but the following projects could be of interest to you in that regard:

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  • $\begingroup$ Hi. Maybe you should explain why exactly the suggested projects might be of interest to the reader. In which way are these projects similar or not to Watson? $\endgroup$ – nbro Jun 30 at 17:47
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Watson Content Analytics implements UIMA framework, according to this https://www.ibm.com/support/knowledgecenter/en/SS5RWK_3.5.0/com.ibm.discovery.es.nav.doc/iiysaovcapipe.htm

UIMA taking care the management of NLP pipeline, but the intelligence is actually comes from ‘annotators’.

You can rely on annotators from projects like GATE, Apache OpenNLP, Stanford CoreNLP, etc. But since these projects are not part of UIMA, they use their own document/sentence representation, so a UIMA wrapper is needed for conversion. GATE provided a detailed documentation for this. https://gate.ac.uk/sale/tao/splitch22.html#chap:uima

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Here are some more, apart from the ones reported in the accepted answer:

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  • $\begingroup$ Hi. Can you explain exactly why these projects might be of interest to the reader that wants to use a tool similar to Watson? Can you provide some description of each of the projects? $\endgroup$ – nbro Jun 30 at 17:48
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Have a look at the ChatScript project, whose description is

ChatScript is a "next Generation" chatbot engine, based on the one that powered Suzette, that won the 2010 Loebner Competition. ChatScript has many advanced features and capabilities that, when properly utilitized, permit extremely clever bots to be programmed. There is also a potentially useful ontology of nouns, verbs, adjectives, and adverbs for understanding meaning.

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