Freebase is a free, knowledge graph with millions of people, places, and things. Freebase contains tens of millions of topics, thousands of types, and tens of thousands of properties. By comparison, English Wikipedia has over 4 million articles.
Freebase has no features, suggest some!Discontinued
- - Freebase is the most popular Web-based alternative to YAGO.
- - Freebase is the most popular free alternative to YAGO.
According to https://developers.google.com/freebase/ the API has been shut down, but there are still data-dumps available.
Towards a Public Data Infrastructure for a Large, Multilingual, Semantic Knowledge Graph
DBpedia has no features, suggest some!
- - DBpedia is the most popular Windows, Mac & Linux alternative to YAGO.
- - DBpedia is the most popular Open Source alternative to YAGO.
OpenCyc is a cut-down open version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine. Cycorp, the builders of Cyc, have set up an independent organization, OpenCyc.Suggest and vote on features
distribution was discontinued in early 2017