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SHARD is a proof-of-concept high-performance, low-cost distributed computing technology to develop a highly scalable triple-store (aka rdf-store, graph-data store) built on Hadoop and HDFS. http://www.dist-systems.bbn.com/people/krohloff/shard.shtml
3store is an RDF "triple store", written in C and backed by MySQL and Berkeley DB. It is an optimisation and port of an older triple store (WebKBC). It provides access to the RDF data via RDQL or SPARQL over HTTP, on the command line or via a C API.