1. Homeland security infrastructure program (HSIP). https://gii.dhs.gov/HIFLD/hsip-guest.
2. Linked Open Data statistics. http://stats.lod2.eu/.
3. Maptitude: Geographic Information System. http://www.caliper.com/maptovu.htm.
4. NHD plus. http://www.horizon-systems.com/nhdplus/.
5. ORIGAMI: Oak Ridge Graph Analytics for Medical Innovation. http://hypothesis.ornl.gov/.