CKAN – Comprehensive Knowledge Archive Network
http://ckan.net/

CKAN is the Comprehensive Knowledge Archive Network, a registry of open knowledge packages and projects (and a few closed ones). CKAN makes it easy to find, share and reuse open content and data, especially in ways that are machine automatable. As a system CKAN functions as a synthesis of several different services shown in the above graphic. As the above diagram shows, CKAN combines the features of a listing/registry, a package index and a wiki. As a registry it acts like freshmeat but for open data and content resources. However it adds to a simple registry in key ways. First, thanks to its underlying versioned domain model CKAN has a wiki-like interface that lets anyone add and material held in it. Second, and unlike a wiki, CKAN can store ‘structured’ information, which allows it to provide ‘index’-like features such as automated registration, discovery and installation of material. In this respect it behaves like CPAN or PyPI in the software world — though again for open data and content not code. This has been added to Knowledge Discovery Subject Tracer™ Information Blog.