A random collection of possible RDF Stores - Sesame This is what we are currently using. - [4Store](http://4store.org/) Here's an [example](http://www.jenitennison.com/blog/node/152) showing an installation run through with data access (although using ruby). - [Virtuoso Open Source](http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main)