This is a snapshot of 'Tinkling', an RDF query engine written in Java. You can download the snapshot (as a gzipped tar) here. The main site for Tinkling is here - you may find a more up-to-date version there.
Tinkling is a deliverable for the SWAD-Europe project, workpackage 7. 7.3 report and 7.4 report describe aspects of the system. Javadoc is also available. It is released under the W3C license.
When you download it, if you're on a unix-like machine (including Mac OS x) type
tar -zxvf tinkling-0.1.tar.gz cd tinkling make askto run a sample in-memory query. You might need to edit the Makefile to show the location of your java - find it by typing 'whereis java'; you should put the bit before 'bin/java' at the top of the Makefile, e.g. on Mac OS X:
% whereis java /usr/bin/java
The Makefile should therefore say:
at the top.