LGD is a LinkedGeoData SPARQL query tool for Quantum GIS.
Install dependencies
pip install sparql-client rdfextras
Set PYTHONPATH environment variable
sudo echo "setenv PYTHONPATH /usr/local/lib/python2.7/site-packages" >> /etc/launchd.conf
Download lgd plugin
git clone git@github.com:StepanKuzmin/lgd.git
Create symlink
ln -s lgd ~/.qgis/python/plugins/lgd