There are many tools that can be used to generate knowledge graphs. Some of these tools are: 1. RDF2Graph 2. Semantic Web Rule Language 3. Web Ontology Language 4. RDF Graph Pattern 5. SPARQL 6. GraphQL 7. Neo4j 8. AllegroGraph 9. Stardog 10.Ontotext GraphDB
There are many more but one of the most popular is neo4j. There are a few reasons why Neo4j is so popular:
1. It is one of the most mature graph databases on the market, with a wide range of features and capabilities.
2. It has a large and supportive community, with many resources available to help users get the most out of the database.
3. Neo4j is highly scalable, meaning it can handle large amounts of data and complex queries with ease.
4. It is relatively easy to learn and use, compared to other graph databases.
5. Neo4j is backed by a well–established company, ensuring that it will continue to be developed and supported in the future.