Wikidata is a free and open knowledge base that can be read and edited by both humans and machines.
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Online

Wikidata is a free and open knowledge base that can be read and edited by both humans and machines.



Atomic-server is a graph database server for storing and sharing Atomic Data. Demo on atomicdata.dev

Semantic MediaWiki (SMW) is a free, open-source extension to MediaWiki – the wiki software that powers Wikipedia – that lets you store and query data within the wiki's pages.
Palantir Foundry allows you to build apps using data from external databases or apps you create in their platform. Imported or inputted data is stored in the "Ontology" which is a relational/graph/linked database hybrid that allows you to represent and relate data...
