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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. Semantic MediaWiki is also a full-fledged framework, in conjunction with many spinoff extensions, that can turn a wiki into a powerful and flexible "collaborative database".

RDF Refine - a Google Refine extension for exporting RDF

"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. Semantic MediaWiki is also a full-fledged framework, in conjunction with many spinoff extensions, that can turn a wiki into a powerful and flexible knowledge management system. All data created within SMW can easily be published via the Semantic Web, allowing other systems to use this data seamlessly."

Piggy Bank is a Firefox extension that turns your browser into a mashup platform, by allowing you to extract data from different web sites and mix them together. Piggy Bank also allows you to store this extracted information locally for you to search later and to exchange at need the collected information with others.

The OpenLink Data Explorer Extension

Delivering Semantic Web Services - Directly to Your Desktop Gnosis is a browser extension for Firefox and Internet Explorer that automatically analyzes content as you browse and provides a variety of tools to explore the people, places, companies, and other items that you're reading about.

"Domeo is an extensible web application enabling users to visually and efficiently create and share ontology-based stand-off annotation on HTML or XML document targets. The tool supports manual, fully automated, and semi-automated annotation with complete provenance records, as well as personal or community annotation with access authorization and control."