Semantic MediaWiki

Semantic MediaWiki (SMW) is an extension of MediaWiki – the wiki-system powering Wikipedia – with semantic technology, thus turning it into a semantic wiki. While articles in MediaWiki are just plain texts, SMW allows users to add structured data, comparable to the data one would usually store in a database.

SOBOLEO - Semantic Social Bookmarking & Lightweight Editing of Ontologies

SOBOLEO (SOcial BOokmarking and Lightweight Engineering of Ontologies) is a web-based, collaborative ontology engineering applications that allows for integrating ontology engineering with social bookmarking.