MedusWiki is a Python Wiki engine intended to be used as a personal knowledge management system. It uses Topic Maps (XTM) to store metadata, meaningful associations could be created between wiki pages. Zope Page Templates (ZPT) are used to produce HTML.
Jumper Search is a collaborative search engine that is powered by social bookmarking. It uses peer and social-networking principles to tag and link distributed content, media, or data to make valuable information more easily discoverable.
The aim of Argos viewpoints server project is to propose a new standard protocol for community-driven organizations of knowledge, and make the collaboration possible beyond the boundaries of the software and of the resulting communities.
Fire.now is a Firefox plugin that automatically adds your documents to the WhereIsNow latest version discovery service. Everytime you upload a document somewhere, Fire.now integrates the WhereIsNow keys into the file and add it's url to WhereIsNow.
...With this PHPNuke module you will be able to publish music information: Artists data, albums, songs, audio samples, chart lists, themes and more. You can install it with no technical knowledge.
The Nokia Semantic Web Server is an RDF based knowledge portal
for publishing both authoritative and third party descriptions of URI
denoted resources. It also serves as Nokia's reference implementation
of URIQA, the URI Query Agent model.