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Wikidata aims to create a free knowledge base about the world that can be read and edited by humans and machines alike. It will provide data in all the languages of the Wikimedia projects, and allow for the central access to data in a similar vein as Wikimedia Commons does for multimedia files. Wikidata is currently in development.

DBpedia is a great and active project dealing with structured data and Wikipedia. Whereas on the first glance DBpedia and Wikidata may look like they have a lot of overlap, they actually do not: they fulfill very different tasks, and there is a small overlap where we need to figure out together how to best co-evolve.

"Wikidata is a collaboratively edited knowledge base hosted by the Wikimedia Foundation. It is a common source of open data that Wikimedia projects such as Wikipedia can use,[4][5] and anyone else, under a public domain license. The used data model is the Resource Description Framework. Wikidata is powered by the software Wikibase.[6]"

Wikidata - the free knowledge base that anyone can edit

Wikidata is a proposed wiki-like database for various types of content. This project as proposed here requires significant changes to the software (or possibly completely new software) but has the potential to centrally store and manage data from all Wikimedia projects, and to radically expand the range of content that can be built using wiki principles.

"This Wikiproject aims to provide structured data to study people's names throughout history, in the whole world, in all languages, for all people present in Wikidata, through structural properties and linguistic information."

Wikidata is a project to create a free knowledge base about the world that can be read and edited by humans and machines alike. It will provide data in all the languages of the Wikimedia projects, and allow for central access to the data in a way similar to what Wikimedia Commons does for multimedia files.

"KBpedia is a computable knowledge structure that combines six (6) public knowledge bases - Wikipedia, Wikidata, OpenCyc, GeoNames, DBpedia and UMBEL - into an integrated whole. The knowledge graph that organizes this computable framework is the KBpedia Knowledge Ontology (KKO). KBpedia is the entirety of the combined knowledge bases; KKO is the schema by which these combined sources are made coherent.[1]"

Wikicat is the bibliographic catalog used by the Wikicite and WikiTextrose projects. It will be implemented as a Wikidata dataset using a datamodel design based upon IFLA's Functional Requirements for Bibliographic Records: final report (FRBR) [1], the various ISBD standards, the Library of Congress's MARC 21 specification, the Anglo-American Cataloguing Rules' The Logical Structure of the Anglo-American Cataloguing Rules and Resource Description and Access (RDA), and the International Committee for Documentation (CIDOC)'s Conceptual Reference Model (CRM)[2]. The history and inter-relation of these various cataloging standards is described in RDA presentations.

"KBpedia is a comprehensive knowledge structure for promoting data interoperability and knowledge-based artificial intelligence, or KBAI. The KBpedia knowledge structure combines six (6) public knowledge bases - Wikipedia, Wikidata, OpenCyc, GeoNames, DBpedia and UMBEL - into an integrated whole. KBpedia's upper structure, or knowle"