GRAKN.AI (https://grakn.ai/) is a powerful, open-source knowledge graph platform. Highly recommended!
- Disclosure: I work at Grakn Labs. That being said, I am convinced that it is one of the most innovative solutions out there, and we have a great community working on really neat projects.
- Disclosure: I work at Grakn Labs. That being said, I am convinced that it is one of the most innovative solutions out there, and we have a great community working on really neat projects.