Annotea Project
Open implementation from the W3C enhancing the W3C's Amaya browser for collaboration with shared annotations. Part of the Semantic Web effort to store annotations as accessible metadata.
www.w3.org/2001/Annotea
DAML.org: DARPA Agent Markup Language Homepage
Program from the Defense Advanced Research Projects Agency to develop a language and tools to facilitate the concept of the semantic web.
www.daml.org
Friend of a Friend Project (FOAF)
Creating a web of machine-readable home pages describing people, the links between them, and the things they create and do.
www.foaf-project.org