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COMET   - Commonsense Transformers for Automatic Knowledge Graph Construction.
Jess   - A rule engine and scripting environment written entirely in Java
MIT ConceptNet   - an open, multilingual knowledge graph.
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.
Probase   - Microsoft Research's knowledge base
Scone   - Scone is a high-performance, open-source knowledge-base (KB) system intended for use as a component in many different software applications.
YAGO   - YAGO is an ontology that is anchored in time and space. Its has accuracy >90%, which was manually confirmed.