#swap
This is a historic project from 2000, which played with ideas of semantic web, linked data, and rule languages. The emphasis was very much on the Web in Semantic Web - the use of an HTTP URI in a grpah was an invitation to follow the link and look up some more graph. There is a lot of cool stuff in here, including cwm, a rule engine for N3 rules, with lots of built-in functions including crypto. So you can build quite interesting applications just using rules.
Also a bunch of programs for converting things into and out of RDF.
See the home pages of:
Those pages are not maintained.
2015: The version history of the original CVS code management project has been preserved in this Github hosted git repository. This is a target GIT repo for import of the CVS repo behind http://www.w3.org/2000/10/swap, an early semantic web platform.