1. GraphChi. https://github.com/GraphChi/graphchi-cpp. GraphChi. https://github.com/GraphChi/graphchi-cpp.
2. GraphLab. www.graphlab.org. GraphLab. www.graphlab.org.
3. Memcached. www.memcached.org. Memcached. www.memcached.org.
4. MySQL. http://www.mysql.com. MySQL. http://www.mysql.com.