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| COMET - Commonsense Transformers for Automatic Knowledge Graph Construction.
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| Jess - A rule engine and scripting environment written entirely in Java
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| MIT ConceptNet - an open, multilingual knowledge graph.
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| NELL: Never-Ending Language Learning |
| Open Information Extraction (university of Washington) |
| OpenCyc - a comprehensive ontology and knowledge base of everyday common sense knowledge and an inference engine.
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| Probase - Microsoft Research's knowledge base
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| Scone - Scone is a high-performance, open-source knowledge-base (KB) system intended for use as a component in many different software applications.
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| YAGO - YAGO is an ontology that is anchored in time and space. Its has accuracy >90%, which was manually confirmed.
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